Question

For 10 observations if mean and variance of the series is 16 and 20 respectively then sum of square of all observation is ________.
[A] 2760 [B] 4000 [C] 3600 [D] 4160​

Answer 1

Explanation:

Perfect questions for guys interested in maths..

2. The value of x + x(xx) when x = 2 is:

(a) 10, (b) 16, (c) 18, (d) 36, (e) 64

Solution:

x + x(xx)

Put the value of x = 2 in the above expression we get,

2 + 2(22)

= 2 + 2(2 × 2)

= 2 + 2(4)

= 2 + 8

= 10

Answer: (a)