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Class XI Maths Statistics 4

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Question 1

For the data given in previous question, choose the correct option:

Question 2

Given data set corresponding to their ranges(Consider sign of deviations also)-

Question 3

Which of the following methods of determining dispersion of data gives least accurate(quantitatively) results-

Question 4

Variance of the data given below is
Size of item 3.5 4.5 5.5 6.5 7.5 8.5 9.5
Frequency 3 7 22 60 85 32 8

Question 5

The mean of two samples of sizes 200 and 300 were found to be 25, 10 respectively. Their standard deviation were 3 and 4 respectively. The variance of combined sample of size 500 is

Question 6

If the mean deviation of the numbers 1, 1 + d, 1 + 2d, ... , 1 + 100d from their mean is 255, then the d is equal to

Question 7

In an experiment with 15 observations on x, then following results were available:

= 2830,

= 170
One observation that was 20 was found to be wrong and was
replaced by the correct value 30. Then the corrected variance is

Question 8

The mean deviation of the series a, a + d, a + 2d, ......, a + 2nd from its mean is

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Oct 28JEE & BITSAT