The mean of 99 items is 55. The value of 100th item is 99 more than the mean of 100 it
What is the value of 100th item?
[Ans. X100
Answers
Answered by
0
Answer:
155
Explanation:
Mean = Sum of elements/ number of elements
let the sum of the first 99 items be S, then:
S/99 = 55
S = 55*99
let the 100th item be x, & the mean of 100 items be M, then:
x = M + 99
M = (S + x)/100
100M = S + M + 99
99M = 55*99 + 99
99M = 99(55+1)
M = 56
x = 56 + 99 = 155
Similar questions