Question

mean of xi =12, 16, 20, 24, 28, 32 and fi =5, 7, 8, 5, 3, 2

Answer 1

use xi × fi
Nd then find total of ( xifi)s
and use

mean = xifi/ fi
and get ur answer

Answer 2

Sigma xi. fi = 60 + 112 + 160 + 120 + 84 + 64 = 600

Sigma fi = 5 + 7 + 8 + 5 + 3 + 2 = 30

Mean ( x bar) = sigma xi. fi/ sigma fi = 600 / 30 = $<h3>20$