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- Multiple ChoicePlease save your changes before editing any questions.
**. Mean of 20 observations is 17. If in the observations, observation 40 is replaced by 12, find the new mean**15.6

15.5

17

18

- Multiple ChoicePlease save your changes before editing any questions.
**Mean of 36 observations is 12. One observation 47 was misread as 74. Find the correct mean****Answer.**11.20

11.25

15

16

- Multiple ChoicePlease save your changes before editing any questions.
**Determine the mean of first 10 natural numbers.**5.5

5.6

10.5

11.5

- Multiple ChoicePlease save your changes before editing any questions.
**Write the class mark of an interval 90 – 120.**105

110

95

100

- Multiple ChoicePlease save your changes before editing any questions.
**There are 50 numbers. Each number is subtracted from 53 and the mean of the numbers so obtained is found to be – 3.5. Find the mean of the given numbers.**55.5

55.9

56.5

55

- Multiple ChoicePlease save your changes before editing any questions.
**If the median of data (arranged in ascending order) 31, 33, 35, x, x+10, 48, 48, 50 is 40, then find value of x.**40

35

50

60

- Multiple ChoicePlease save your changes before editing any questions.
**To draw a histogram to represent the following frequency distribution :********Find the adjusted frequency for the class 25-45.**2

5

8

15

- Multiple ChoicePlease save your changes before editing any questions.
**Find the mean of the following distribution**20

19

28

45

- Multiple ChoicePlease save your changes before editing any questions.
**The scores of an English test out of 100 of 20 students are given below :****75, 69, 88, 55, 95, 88, 73, 64, 75, 98, 88, 95, 90, 95, 88, 44, 59, 67, 88, 99.****Find the median**90

88

95

100

- Multiple ChoicePlease save your changes before editing any questions.
A teacher wanted to analyse the performance of two sections of students in a mathematics test of 100 marks. Looking at their performances, she found that a few students got under 20 marks and a few got 70 marks or above. So she decided to group them into intervals of varying sizes as follows

0 – 20, 20 – 30, …, 60 – 70, 70 – 100. Then she formed the following table

Find the probability that a student obtained less than 20% in the mathematics test

7/90

20/90

15/90

1/90