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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