# Five number summary calculator

For five number summary calculation, please enter numerical data separated with comma (or space, tab, semicolon, or newline). For example: -751.3 788.1 -289.3 510.8 227.8 707.0 346.9 972.4 342.2 -466.0 250.0 431.2 243.3### Five number summary

A five number summary consists of these five statistics:the minimum,

Q1 (the first quartile, or the 25% mark),

the median,

Q3 (the third quartile, or the 75% mark),

the maximum,

The five-number summary gives you a rough idea about what your data set looks like. For example, you’ll have your lowest value (the minimum) and the highest value (the maximum) or more concentrated data.

The main reason you’ll want to find a five-number summary is to find more useful statistics, like the interquartile range IQR, sometimes called the middle fifty.

### How to enter data as a frequency table?

Simple. Write data elements (separated by spaces or commas, etc.), then write f: and further write the frequency of each data item. Each element must have a defined frequency that counts numbers before and after symbol f: must be equal. For example:1.1 2.5 3.99

f: 5 10 15

### How to enter grouped data?

Grouped data are formed by aggregating individual data into groups so that a frequency distribution of these groups serves as a convenient means of summarizing or analyzing the data.group | frequency |

10-20 | 5 |

20-30 | 10 |

30-40 | 15 |

10-20 20-30 30-40

f: 5 10 15

### How to enter data as a cumulative frequency table?

Similar to a frequency table, but instead, f: write cf: in the second line. For example:10 20 30 40 50 60 70 80

cf: 5 13 20 32 60 80 90 100

The cumulative frequency is calculated by adding each frequency from a frequency distribution table to the sum of its predecessors. The last value will always equal the total for all observations since the calculator will have already added all frequencies to the previous total.

### Questions

#### Question1:

There seems to be a problem with the 5-figure calculator. I placed the following data set and the Q3, giving a wrong value. 8, 12, 9, 8, 16, 10 ,14, 7, 5, 21, 13, 10, 8, 10, 11, 8, 11, 9, 11, 14. I used The program, against TI and Casio graphics calculator as well as a different program. This website gave me 12.75, while the calculators and the other website gave me 12.5.

#### Answer1:

All seems OK. But there are at least three methods to compute quartiles.

For large numbers of data, all methods converge to the same results. For small datasets, the methods differ in how they interpolate gaps in the input data.

#### Answer2:

Q3 in case 20 values, so its indexes is 0... 19

quartile3 index is 19*0.75 = 14.25

and quartile3 value Q3 = 0.75*12+0.25*13 = 12.25

#### Question2

Your Quartile calculator has an error. Both Q1 & Q3 are incorrect with the data set below. Your calculator says Q1 is 13 and Q3 is 44. Correct answers: Q1 is 13.5 and Q3 is 41. Verified with third party and Excel spreadsheet. There is definitely a problem with your code. When a data set has an even number of items all three methods will have the same result!! In my example, Q1 should be 13.5 no matter what!

{0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 18, 18, 19, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 26, 26, 26, 26, 27, 28, 28, 28, 28, 28, 29, 30, 30, 30, 31, 31, 31, 31, 31, 31, 31, 33, 33, 33, 33, 34, 34, 34, 34, 35, 35, 36, 37, 37, 38, 38, 38, 38, 38, 38, 38, 40, 41, 41, 41, 42, 43, 44, 44, 44, 44, 45, 45, 45, 45, 45, 45, 45, 45, 46, 47, 47, 48, 48, 48, 49, 49, 50, 50, 51, 51, 52, 52, 52, 52, 52, 53, 54, 54, 54, 55, 55, 55, 56, 56, 56, 56, 57, 59, 61, 61, 63, 63, 69, 70, 70, 77, 80}

#### Answer2

Hi Peter, Thank you for adding the method buttons! So I see "Method 2" is the algorithm you had before. "Method 1" is more accurate and the preferred method. "Method 2" is acceptable but still has the same bug as before. It only happens when the data set is even. Again, Q1 & Q3 results should be the same for evens regardless of method per the Wikipedia article. I'll give you a really simple example which shows the error I've been talking about all along. Try data set { 3, 7, 7, 9 }. Each method gives different results but Method 1 is indeed correct. Q1 should be 5 and Q3 should be 8 for both methods. Hope this helps!

Consider the set:

{1,2,3,4,5,6,7,8,9,10,11,12,13}

Clearly, Q2 is 7, Q1 is 3.5, and Q3 is 10.5. However, your program yields

"Quartile Q1: 4

Quartile Q2: 7

Quartile Q3: 10"

^ This is incorrect.

I think the error in the algorithm is in how it creates the lower and upper halves after finding Q2.

Consider the set:

{1,2,3,4,5,6}

If the list is of even length, Q2 will be the average of the two middle values (e.g. Q2 = [3+4]/2 = 3.5) . Hence, the lower half should be a list ranging from the LOW (i.e. the lowest value in the original set of values) to the floor of Q2 (e.g. if Q2=3.5, the floor of Q2 is 3). Hence,

lower half = {1,2,3}

The upper half should range from the ceiling of Q2 (e.g. is Q2=3.5, the ceiling of Q2 is 4) to the HIGH (i.e. the highest value in the original set of values). Hence,

upper half = {4,5,6)

A visual:

1 2 3 4 5 6

1 * 3 * 4 * 6

Q2 = 3.5

Q1 = 2

Q3 = 5

## Practice problems from statistics:

- Median and modus

Radka made 50 throws with a dice. The table saw fit individual dice's wall frequency: Wall Number: 1 2 3 4 5 6 frequency: 8 7 5 11 6 13 Calculate the modus and median of the wall numbers that Radka fell. - The median 2

Here is a list of numbers: 9.9, 5.9, 3.6, 6.2, 8.9, 0.7, 4.4, 6.7, 9.9, 0.7 State the median. Give your answer as a decimal. - Employees 70614

The company has 18 employees aged 26-52. The age groups of the employees are: 3 employees aged 52 years, 2 aged 32 years, 1 ... 26 years old, 5 ... 36 years old, 4 ... 45 years old, and 3 ... 50 years old. Determine the median. - Third tests

Third periodical tests are 98, 97, 86, 94, 90, 97, 91, and 94. Find the median of her grades and interpret the result. - Find mean

Find mean of two numbers: -4 and 5 (first is negative four). - Increase the mean

To which number should the number 4 be changed between the numbers 4,5,7, 1,0,9,7,8, -3,5 to increase these numbers' arithmetic mean by 1.25? - A Gallup

A Gallup poll investigated whether adults in Mumbai preferred staying at home or going out as their favorite way of spending time in the evening. Out of the 500 adults, the majority of adults (70%) indicated that staying at home was their favorite evening - The size 2

The size of pants sold during one business day in a department store is 32, 38, 34, 42, 36, 34, 40, 44, 32, and 34. Find the average size of the pants sold. - Harmonic HM example

Find the harmonic mean of 4 and 8. - Below 5

Below is a collection of test scores from a class of 20 students. Make 2 histograms of the data. Choose your own horizontal scales as long as you have more than 4 cells in each histogram. 65 70 68 87 98 91 77 85 70 72 86 86 94 95 67 88 77 99 74 71 - 45 percentile

Given the following data 11 15 24 33 10 35 23 25 40 What is P45?

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