# The mean of the following distribution is 50. Find the value of a and the frequencies of 30 and 70 X 10 30 50 70 90 f 17 5a+3 32 7a-11 19

2
by REVIL

2016-03-05T16:48:11+05:30

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X                          F                               fx

10                         17                           170
30                        5a+3                          15a + 90
50                           32                             1600
70                            7a-11                       490 a - 77
90                           19                             1080

total                          60 + 12a                   505a + 2863

we have given mean = 50

∑fx/N = 50

505a + 2863/60 + 12a = 50

505a + 2863 = 50(60 +12a)

505a + 2863 = 3000+ 600a

505a + 600a = 3000- 2863
-5a = 137

a = -27.4
yeah .....I have mistaken in addition.
you are correct !!
okay thanks I was thinking that I am wrong