Question

The mean of the following data is 15. Find the value of "F".
Class Interval Frequency
0 - 6 5
6 - 12 4
12 - 18 F
18 - 24 6
24 - 30 4
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Answer 1

Step-by-step explanation:

Mean =∑fi∑xifi

⇒mean =6+p+6+10+5(5×6)+(10×p)+(15×6)+(20×10)+(25×5)

⇒mean =27+p30+10p+90+200+125=15

⇒405+15p=445+10p

⇒5p=40

⇒p=8

Answer 2

CI. fi. xi. fixi

0 - 6 5 3 15

6 - 12 4 9 36

12 - 18 F 15 15f

18 - 24 6 21 126

24 - 30 4 27 108

€fi=19+f €fixi=285+f

$= > 15 = \frac{fixi}{fi}$

$= >15 = \frac{285 + f}{19 + f}$

$= > 285 + 15f = 285 + f$

f= 0