Statement 1 is false, statement 2 is true

Statement 1 is true, statement 2 is true; statement 2 is a correct explanation for statement 1

Statement 1 is true, statement 2 is true; statement 2 is not a correct explanation for statement 1

Statement 1 is true, statement 2 is false

Statement 1 is true, statement 2 is true; statement 2 is a correct explanation for statement 1

Statement 1 is true, statement 2 is true; statement 2 is not a correct explanation for statement 1

Statement 1 is false, statement 2 is true

JEE Questions for Maths Statistics Quiz 12

0%
0%
2)
0%
0%

The variance of α, β and γ is 9, then variance of 5α, 5β and 5γ is

0%
45
0%
9/5
0%
5/9
0%
225

A batsman scores runs in 10 innings 38, 70, 48, 34, 42, 55, 63, 46, 54, 44, then the mean deviation is

0%
8.6
0%
6.4
0%
10.6
0%
9.6

0%
81
0%
7.6
0%
9
0%
2.26

0%
78.00
0%
188.66
0%
177.33
0%
8.33

The quartile deviation of daily wages (in Rs.) of 7 persons given below 12, 7, 15, 10, 17, 19, 25 is

0%
14.5
0%
5
0%
9
0%
4.5

Karl-Pearson\'s coefficient of skewness of a distribution is 0.32. Its S.D. is 6.5 and mean 39.6. Then the median of the distribution is given by

0%
28.61
0%
38.81
0%
29.13
0%
28.31

0%
n
0%
2)
0%
0%

For two data sets, each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4, respectively. The variance of the combined data set is

0%
0%
2)
0%
6
0%

0%
0%
2)
0%
0%
None of these

0%
0%
2)
0%
0%

Mean of 100 observations in 45. It was later found that two observations 19 and 31 were incorrectly recorded as 91 and 13. The correct mean is

0%
44.0
0%
44.46
0%
45.00
0%
45.54

0%
0%
2)
0%
0%

0%
154
0%
155
0%
160
0%
161

0%
90°
0%
28°
0%
150°
0%
144°

The mean and S.D. of the marks of 200 candidates were found to be 40 and 15 respectively. Later, it was discovered that a score of 40 was wrongly read as 50. The correct mean and S.D. respectively are

0%
14.98, 39.95
0%
39.95, 14.98
0%
39.95, 224.5
0%
None of these

0%
0%
2)
0%
0%
None of these

In a series of 2n observations, half of them equal to a and remaining half equal to –a. If the standard deviation of the observations is 2, then |a| equals

0%
0%
2)
0%
2
0%

0%
0%
2)
0%
0%
None of these

0%
10.0
0%
20.0
0%
10.1
0%
20.2

The mean of the numbers a, b, 8, 5, 10 is 6 and the variance is 6.80. Then which one of the following gives the possible values of a and b ?

0%
a = 5, b = 2
0%
a = 1,b = 6
0%
a = 3, b = 4
0%
a = 0, b = 7

If the average of the numbers 1, 2, 3,……,98, 99, x is 100x, then the value of x is

0%
0%
2)
0%
0%
0%

0%
80
0%
25
0%
20
0%
16
0%
4

Coefficient of variations of two distributions are 55 and 65 and their standard deviations are 22 and 39 respectively. The arithmetic means are respectively

0%
15, 20
0%
40, 60
0%
30, 50
0%
None of these

0%
Statement 1 is true, statement 2 is true; statement 2 is a correct explanation for statement 1
0%
Statement 1 is true, statement 2 is true; statement 2 is not a correct explanation for statement 1
0%
Statement 1 is true, statement 2 is false
0%
Statement 1 is false, statement 2 is true

0%
Statement 1 is true, statement 2 is true; statement 2 is a correct explanation for statement 1
0%
Statement 1 is true, statement 2 is true; statement 2 is not a correct explanation for statement 1
0%
Statement 1 is true, statement 2 is false
0%
Statement 1 is false, statement 2 is true

The mean age of a combined group of men and women is 25 years. If the mean age of the group of men is 26 and that of the group of women is 21, then the percentage of men and women in the group is