(2019 Main, 12 April I)
a) 2√2 b)2 c)4 d)√2
Q2) If both the mean and the standard deviation of 50 observations x1, x2, ......., x50 are equal to 16, then the mean of (x1 - 4)^2 , (x2 - 4)^2,.......,(x50 - 4)^2 is
a) 480 b) 400 c) 380 d) 525
Q3) The mean and the median of the following ten numbers in increasing order 10, 22, 26, 29, 34, x, 42, 67, 70, y are 42 and 35 respectively, then y/x is equal to
a) 2√2 b)2 c)4 d)√2
Q2) If both the mean and the standard deviation of 50 observations x1, x2, ......., x50 are equal to 16, then the mean of (x1 - 4)^2 , (x2 - 4)^2,.......,(x50 - 4)^2 is
(2019 Main, 10 April II)
a) 480 b) 400 c) 380 d) 525
Q3) The mean and the median of the following ten numbers in increasing order 10, 22, 26, 29, 34, x, 42, 67, 70, y are 42 and 35 respectively, then y/x is equal to
(2019 Main, 9 April II)
a)7/3 b)7/2 c)8/3 d)9/4
Q4) A Student scores the following marks in five tests 45, 54, 41, 57, 43. His score is not known for the sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is
(2019 Main, 8 April II)
a)10/3 b)10/√3 c)100/√3 d)100/3
Q5) The mean and variance of seven observations are 8 and 16, respectively. If 5 of the observations are 2, 4, 10, 12, 14, then the product of the remaining two observations is
(2019 Main, 8 April I)
a)45 b)49 c)48 d)40
Answers
Q1) b
Q2) b
Q3) a
Q4) b
Q5) c