Statistics — practice questions, page 3
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The monthly incomes (in ₹ thousand) of five households are 30, 32, 35, 38 and 400. Which average…If 10 is added to every observation of a data set, which of the following stays unchanged?Take the deviations of 5, 9, 12, 14, 20 from their arithmetic mean. What is the sum of these…Find the median of 8, 3, 12, 5, 10, 7, 15.A shoe shop noted the sizes of the last 12 pairs it sold: 7, 8, 6, 8, 9, 7, 8, 10, 8, 7, 6, 9.…Blood groups of 30 donors at a camp in Lucknow were: A – 9, B – 11, AB – 3, O – 7. Which is the…Monthly electricity bills of six flats in a Jaipur building were ₹1,240, ₹980, ₹1,560, ₹1,100,…Minimum temperatures in Shimla over one week were 14, 17, 15, 13, 16, 19 and 12 °C. What is the…Find the mode of the data 21, 25, 21, 30, 25, 21, 28, 30, 21.Group A holds 11, 15, 19, 23 and 27; group B holds 14, 18, 22 and 26. What is the median of all…The dot plot shows the goals scored by a school hockey team in each of its 15 matches this season.…What is the mean of the first 15 multiples of 4?The stem-and-leaf display shows the marks of 13 candidates in a typing test. What is the median…In a set of 11 observations arranged in ascending order the median is 40. The two smallest values…The mean of 6 consecutive odd numbers is 34. What is the largest of them?The line chart shows the number of visitors (in thousands) to a museum in Mysuru over six months.…The bar chart shows the cups of tea sold by a stall at Howrah station on six days. What is the…A survey of 20 households in a Bhopal colony recorded how many mobile phones each owns: 1 phone –…The number of siblings of 25 pupils is: 0 siblings – 4 pupils, 1 – 10, 2 – 7, 3 – 3, 4 – 1. What…The numbers 6, 9, x, 16 and 19 are in ascending order and their mean equals their median. Find x.Eight numbers have a mean of 35. Three of them have a mean of 28 and another three have a mean of…The marks of 9 students are 36, 41, 28, 47, x, 33, 52, 39 and 44. If the median of all nine marks…The mean of 10 consecutive integers is 24.5. What is the median of the smallest five of them?Five observations are x + 1, x + 4, x + 6, x + 13 and x + 16. If their mean is 21, what is their…The data 3, 5, 7, x, 9, 5, 7, 3 has 7 as its only mode. What is the mean of the data?
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