Statistics - practice problems
Number of problems found: 382
- A student 2
A student randomly selected 225 college students and asked them whether they ate breakfast that morning before coming to campus. There were 57 students that were at least 25 years old, of which 30 had breakfast that morning. Of the 168 students that were - Z-score
The mean adult male pulse rate is 67.3 beats per minute with a standard deviation of 10.3. Find the z-score for an adult male’s pulse rate of 75. (Round the z-score to two decimal places. ) - Bottles 5
Sections A 9 1/2, sections B 7 1/3, sections C 8 3/4. what is the average collection of bottles per section? - The size 2
The size of pants sold during one business day in a department store are 32, 38, 34, 42, 36, 34, 40, 44, 32, and 34. Find the average size of the pants sold. - Average score
In a math exam, two students scored 95, six students scored 90, 3 students scored 80, and one students scored 50. What was the average score for the class? - Publishing company
Suppose you work for a publishing company and before launching a new magazine targeting fashion-oriented consumers, your boss wants to hold a meeting with perspective advertisers. Assume that annual expenditures on magazine ads in this genre are normally - The average 3
The average of fraction is 7/10. One of the fractions is 2/3, the other fraction is? - Manufacturing company
A random sample of 8 manufacturing companies is selected from a population of manufacturing companies. The market values (in millions of rands) of these eight manufacturing companies are: 17 65 117 206 172 181 221 94 What is the lowest and highest market - A professor
A professor in a typing class found out that the average performance of an expert typist is 85 words per minute. A random sample of 16 students took the typing test and an average speed of 62 words per minute was obtained with a standard deviation of 8. C - Five number summary
Find the five-number summary for these data and make a boxplot. 14,5,12,19,2,35,5,4,3,7,5,8 - Between two mixed
What is the rational number between 2 1/4 and 2 4/5? - Dataset: Dataset: 35 22 18 54 22 46 28 31 43 22 14 17 25 19 33 14. 1 Group the data into a grouped distribution using 6 classes of equal width. 2. Determine the mean, median, and mode using the raw data. 3. Draw an Ogive curve corresponding to the data and use it
- Statistical survey Write TRUE OR FALSE for each question: 1 Standard deviation is a measure of central location. 2. The most frequent observation in a data set is known as the mode. 3 The most passive method of data collection is observation. 4 Access time for secondary dat
- Harmonic HM example
Find the harmonic mean of 4 and 8. - The raw The raw data presented here are the scores (out of 100 marks) of a market survey regarding the acceptability of new product launched by a company for a random sample of 50 respondents: 40 45 41 45 45 30 30 8 48 25 26 9 23 24 26 29 8 40 41 42 39 35 18 25 3
- The data The data set represents the number of cars in a town given a speeding ticket each day for 10 days. 2 4 5 5 7 7 8 8 8 12 What is the IQR?
- Marketing Year; money spent on advertising; profit 2008 2 12 2009 5 20 2010 7 25 2011 11 26 2012 15 40 1. draw a scatter diagram depicting the data. 2. calculate the Pearson's correlation coefficient. 3. determine the linear regression equation.
- Tennis aces
The number of aces served by Novak Djokovic in the last 20 tournaments that he has participated in, is shown below. 12 17 13 7 8 14 11 14 10 12 15 9 11 13 6 15 18 5 19 24 1.1 using the raw, determine the range. 1.2 Group the data into a frequency distribu - Life expectancy
The life expectancy of batteries has a normal distribution with a mean of 350 minutes and standard deviation of 10 minutes. What the range in minutes 68% of the batteries will last? What is the range in minutes approximately 99.7% of batteries will last? - Carpenters
Carpenters 1 and 2 spend ten days and five days respectively to make one table. If 50 tables were made by the first carpenter and 30 tables were made by the second carpenter, What is the average time spent on the products?
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