Question

73.
A student score 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:
10
100
(A)
(B)
3
3
100
10
(C)
(D)
3
3
က
109​

Answer 1

Answer:

Let score of 6th test be x

then, 

x=48







correct option (i)

Option 1)



Option 2)



Option 3)



Option 4)



Answer 2

Answer:

hope it is helpful ........