find p if the mean of given data is 15.45
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Answers
Answer:
Step-by-step explanation:
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Answer:
The value of P = 10
Step-by-step explanation:
Given data
class 0-6 6-12 12-18 18-24 24-30
frequency 6 8 p 9 7
mean of the above data = 15.45
the formula for mean = ∑ / ∑
here the values of ∑ and ∑
will calculate in the following table
class frequency () class mark (
)
0-6 6 0+6/2 = 3 18
6-12 8 9 72
12-18 p 15 15p
18-24 9 21 189
24- 30 7 27 189
∑ = 6 +8 +p+ 9+ 7 = 30+p
∑ = 18+ 72+ 15p+ 189+ 189 = 468+15p
mean =
from given data mean =15.45
⇒ = 15.45
⇒ 468 +15p = 15.45(30+p)
⇒ 468 +15p = 463.5+ 15.45p
⇒ 15.45p-15p = 468 - 463.5
⇒ 0.45p = 4.5
⇒ p = 4.5 /0.45
⇒ p =10