Question

if the mean of the above distribution is 54,find the missing frequency x​

Answer 1

Answer:

56

Explanation:

1. 13 is answer.......................................................

Answer 2

Answer:

mean = 54

frequency = 80 + x

xi= 10, 30, 50, 70, 90 = 250

fixi= 250 x 80+x

Explanation:

mean = Efixi/fi

54= 250 x  80+x /80 + x

54 = 20000 + x / 80 + x

50 ( 80 + x ) = 20000 + x

4000 + x = 20000 + x

4000 - 20000 = -2 x

-1600 = -2x

1600/2 = x

800 = x

40 = x