Statistics - math word problems - page 15 of 46
Number of problems found: 919
- Chi square
A phone battery manufacturer claims that his battery lives are approximately normally distributed with a standard deviation equal to 0.9 years. Suppose a random sample of 10 of these batteries has a standard deviation of 1.2 years. Do you think that the s - Company 5
The Photo-Lab company offers digital photo development in the size 9 × 13 cm for 2 CZK per photo, with a flat handling fee of 50 CZK added to each order (regardless of the number of photos). Calculate the effective price per photo if we order 1, 5, 20, or - Two methods
A teacher wishes to teach verbs to his English class using two methods. He randomly divided the class into two samples of 14 students each. Using Method 1, the students learned an average of 43.8 with a standard deviation of 4.6, while the second group (M - Compare distributions
Which would you expect to be larger, the standard deviation of 5 random numbers picked from 1 to 47 in the California Super Lotto (CSL - write 1 as a result), or the standard deviation of 5 random numbers picked from 1 to 69 in the multi-state PowerBall L - RBA
Regional Building Authority has an annual budget of EUR 983976. In the previous calendar year, has processed 564 approval procedures. How much does an average one-building approval cost (e.g., unsuccessful revoke)? - Statistical file characteristics
Determine the median, mode, arithmetic mean, variance, standard deviation, range of variation, and coefficient of variation of the character x in the statistical file: 2x 9, 7x 10, 9x 11, 11x 15, 15x 17, 16x 19, 13x 21, 10x 25, 9x 29, 4x 32 - Read adventure book
Eve read 20 pages of the adventure book on Monday, 15 on Tuesday, and 19 on Wednesday. She did not read on Thursday but read 36 pages on Friday. On average, how many pages per day did she read? - Hockey cards
Maroš received hockey cards as a reward after his certificate. The number of cards he received is twice the sum of the marks on his report card. Maroš has 8 subjects, and his average grade on his report card was 1.75. How many hockey cards did Maroš get? - 10km race
Joan's finishing time for the Bolder Boulder 10 km race was 1.77 standard deviations faster than the women in her age group. 415 women ran in her age group. Assuming a normal distribution, how many women ran more quickly than Joan? - Seedlings
The meadow was divided into 30 equally large parts, and then how many seedlings were in each part was calculated. It was found that there were no seedlings in six parts. Five parts contained one seedling, twelve parts two seedlings, and seven parts three - When finding out
When finding out the number of minor children in 18 households, these results were obtained: 0, 2, 2, 2, 1, 1, 1, 1, 1, 0, 3, 2, 1, 1, 0, 2, 3, 2 . a. Arrange the values of the variable by size. b. Construct a frequency distribution table and calculate re - Sport shooting During small-bore rifle shooting, the following scores were achieved in one series: 9, 9, 8, 9, 10, 6, 8, 9, 9, 10, 8, 7, 6. a. Arrange the values in ascending order. b. Construct a frequency distribution table and calculate the relative frequencies and r
- Melon sales
Alfonz grew 150 melons with an average weight of 2.35 kg. He sold them for € 1.50 per kg. How much did he earn? The result is rounded to the euro. - Confidence Interval The average grade of 50 senior students in a statistics class is 85, with a standard deviation of 10.2. In comparison, 60 senior students got an average of 80 with a standard deviation of 8.9. Can the difference in the mean grade be attributed to chance,
- Teacher's ages The ages of the 10 teachers of a School are 32, 41, 67, 55, 23, 25, 28,40, 22, 35. Find out the range of the age of teachers.
- Variability
In the table below, the number of wrong produced goods in two shifts: morning shift: 2; 0; 6; 10; 2; 2; 4; 2; 5; 2; afternoon shift: 4; 4; 0; 2; 10; 2; 6; 2; 3; 10; Compare the variability in both shifts, compare the average number of wrong goods on both - Christina - Samuel
Samuel is 2 cm higher than the average height of the pupil in the class. Christina is 7 cm lower than the average height. How taller is Samuel than Christina? - Height estimation men What is the smallest number of men we would have to choose to estimate the mean height of men with an accuracy of +, - 0.5 cm, and 95% confidence, assuming a standard deviation of 8 cm?
- Elephant population
In 1979, 1.3 million elephants lived in Africa. By 1989, their number had dropped to 600,000. On average, how many elephants have died each year during this period? - Statistics
The sum of all deviations from the arithmetic mean of the numerical sequence 4, 6, 51, 77, 90, 93, 95, 109, 113, 117 is:
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