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STATISTICS XI CLASS
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1. Calculate the mean marks from the following data. Marks
20-25
25-30
30-35
35-40
40-45
45-50
50-55 No. of students
10
12
8
20
11
4
5
4 points
35.5
34.5
44.5
47.5
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2. The mean of the following frequency distribution is 50. find the missing frequencies f1 and f2 Class 0-20 0-40 40-60 60-80 80-100 F 17 f1 32 f2 19 TOTAL 120
4 points
27,23
28,24
30.38
23,25
Clear selection
3. Class 37-46 47-56 57-66 67-76 67 or more F 19 23 27 28 28
4 points
Option 1
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4. While checking the value of 20 observations, it was noted that 125 was wrongly noted as 25 while calculating the mean and then the mean was 60. Find the correct mean.
4 points
56
67
65
98
Clear selection
5.The mean of 10 observations was found to be 28. Later, it was discovered that one observation 14 was misread as 24. Find the correct mean? (A) 25 (B) 26 (C) 27 (D) 29
2 points
25
26
27
29
Clear selection
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