Statistics — practice questions, page 7
Browse practice questions
QuestionFind the variance of the distribution x = 1, 2, 3, 4, 5 with frequencies 2, 3, 5, 3, 2.QuestionFifteen readings in ascending order are 11, 14, 17, 19, 22, 25, 26, 28, 31, 33, 35, 38, 41, 44 and…QuestionThe box plots compare the marks of two sections in a mock test. Which section has the larger…QuestionFind the mean deviation about the median of 2, 5, 6, 8, 10, 11 and 14.QuestionA variable x has mean 30 and standard deviation 6. What are the mean and standard deviation of z =…QuestionThe dot plot shows how many pupils were absent on each of 10 school days. Find the mean deviation…QuestionThe stem-and-leaf display gives the waiting times (minutes) of 12 patients at a clinic in Nagpur.…QuestionFund X has mean monthly return 12% with SD 3%; Fund Y has mean 9% with SD 2%. Which fund is less…QuestionA distribution has Q1 = 30, median = 42 and Q3 = 50. Using Bowley's measure (Q3 + Q1 − 2·Median) ÷…QuestionIshaan scored 68 in Physics (class mean 60, SD 5) and 75 in Chemistry (class mean 65, SD 8). In…QuestionThe five observations x, x + 2, x + 4, x + 6 and x + 8 have mean 11. Find their variance.QuestionA temperature sensor has mean reading 40 °C with SD 5 °C. Any reading more than 2 SDs away from…QuestionNine observations have mean 20 and variance 10. A tenth observation equal to 20 is added. What is…QuestionWhat is the variance of 25 consecutive multiples of 3, such as 3, 6, 9, …, 75?QuestionFind the mean deviation about the mean of the distribution x = 2, 4, 6, 8, 10 with frequencies 1,…QuestionTwo numbers have a mean of 15 and a standard deviation of 4 (divisor n). What is their product?QuestionThe histogram shows the scores of 26 players in a fitness test. Using class marks, find the…QuestionFind the variance of the 11 numbers 7, 11, 15, …, 47 (they go up in steps of 4).QuestionTwo groups of 25 students each have mean marks 30 and 40 and variances 16 and 9. Find the variance…QuestionAges of 50 visitors to a library: 0–10 years – 5, 10–20 – 8, 20–30 – 15, 30–40 – 16, 40–50 – 6.…QuestionThree numbers in arithmetic progression have common difference 6 and mean 20. Find their standard…QuestionSections A and B have the same coefficient of variation, 15%. Section A's mean is 60 and section…QuestionMarks of six students are 45, 52, 60, 48, x and 55, and their mean is 52. Find the standard…QuestionTen values are all equal to 20. One of them is then changed to 30. What is the new standard…QuestionSeven observations have mean 8 and variance 16. Five of them are 2, 4, 10, 12 and 14. What are the…
← Previous · Page 7 of 8 · Next →