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+1 vote
8.5k views
in Statistics and Probability by (47.4k points)
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The mean of the following frequency distribution is 62.8 and the sum of all frequencies is 50. Compute the missing frequencies f1 and f2.

Class Interval 0-20 20-40 40-60 60-80 80-100 100-120
Frequency 5 f1 10 f2 7 8

1 Answer

+2 votes
by (47.8k points)
selected by
 
Best answer

Mean \(\bar{x}\) = 62.8

∑x = 50

30 + f1 + f2 = 50 (given) 

by (10 points)
+1
How did you get 3140
by (28.9k points)
+1
Σf_i x_i=Mean x Σf_i= 62.8 x 50 = 3140

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