Question

Mean of 50 observations is same as that
of mean of
of observations after an
observation 45 is dropped. What is the
mean of 50 observations?
(D 15)
a) 45
b) 50
c) 52 d) None​

Answer 1

Solution :

Question :

From a series of 50 observations an observation of value 45 is dropped but the mean remain same. What was mean of 50 observation ?


Let the observation mean be x , then Sum of 50 Observations is 50x

According to the Question :

⇒ [( 50x - 45)/49 ] x

⇒ 50x - 45 = 49x

⇒ x = 45


Therefore , From a series of 50 observations an observation of value 45 is dropped but the mean remain same , then the mean of 50 observations is 45