Statistics — practice questions, page 2
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In a factory, 20 workers earn an average daily wage of ₹450, 30 workers earn ₹500 and 50 workers…The average monthly salary of all employees of a firm is ₹60,000. The 12 officers earn an average…A data set of 50 observations has mean 42. The mean of the first 20 is 40 and the mean of the last…A student scores 80 in Maths, 70 in Physics, 60 in Chemistry and 75 in English. The weights of the…A course grade is 25% unit test, 35% mid-term and 40% final exam. Riya scored 60 in the unit test…The mean of 20 observations was 45. One observation was taken as 65 by mistake, and after…For 20 observations the mean is 10 and the variance is 4 (divisor n). Later one observation 8 is…Three years ago the average age of a family of 5 members was 17 years. A baby has since been born,…The range of a data set is 15. Every observation is multiplied by 3 and then 7 is added to it.…Find the mean deviation about the mean of 4, 7, 8, 9, 10, 12, 13, 17.Find the mean deviation about the median of 13, 17, 16, 14, 11, 13, 10, 16, 11, 18, 12, 17.Find the mean deviation about the median of 3, 9, 5, 3, 12, 10, 18, 4, 7, 19, 21.Find the standard deviation of 2, 4, 4, 4, 5, 5, 7, 9 (use n as the divisor).Find the variance of 5, 12, 3, 18, 6, 8, 2, 10 (use n as the divisor).For 5 observations, the mean is 4.4 and the variance is 8.24. Three of the observations are 1, 2…Group A has 50 values with mean 60 and SD 8; group B has 50 values with mean 70 and SD 6. What is…A data set has mean 20 and standard deviation 4. If 5 is added to every observation, what are the…Values x are coded as y = (x − 50)/10. For y, the mean is −0.4 and the SD is 1.8. What are the…The daily temperatures of a city in a week have an SD of 5 °C. What is their SD in °F? (F = 9C/5 +…Batsman A has a mean score of 50 with SD 15; batsman B has a mean of 40 with SD 10. Who is more…Runs of player P in 5 matches: 30, 40, 50, 60, 70. Runs of player Q: 45, 50, 50, 55, 50. What is…For the data 3, 5, 7, 8, 12, 13, 14, 18, 21, take Q1 and Q3 as the medians of the lower and upper…Marks of 10 students: 38, 22, 45, 31, 52, 25, 40, 29, 49, 34. Taking Q1 and Q3 as the medians of…For the data 4, 8, 11, 15, 16, 19, 24, 27, take Q1 and Q3 as the medians of the lower four and…Which measure should be used to compare the variability of heights (in cm) with the variability of…
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