Question

The mean of the following data is 18.75. Find the value of p Class mark (x) 10,5,p,25,30 Frequency (y) 5,10,7,8,2

Answer 1

f           x           fx
5          10         50
10         5          50
7           p           7p
8           25        200
2           30        60
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∑f = 32
∑fx = 360 + 7p

Mean = ∑fx/∑f = (360 + 7p)/32 = 18.75

⇒ 360 + 7p = 18.75x32 = 600
7p = 600 - 360
7p = 240
p = 240/7 = 34.29

Answer 2

Answer:

since the answer is 34.29