find the value of p if the mean of the following distribution is 7.5 classes 2-4| 4-6| 6-8| 8-10| 10-12| 12-14| and f 6|8|15|p|8|4
Answers
Answer:
30
Step-by-step explanation:
75/10=303+9p/41+p
75(41+p)=10(303+9p)
3075+75p=3030+90p
3075_3030=-75p+90p
45=15p
45-15=p
30=p
Answer:
Value of p = 3 .
Step-by-step explanation:
We are given the mean of following distribution below;
Classes Frequency (f) X X*f
2 - 4 6 3 18
4 - 6 8 5 40
6 - 8 15 7 105
8 - 10 p 9 9*p
10 - 12 8 11 88
12 - 14 4 13 52
∑f = 41 + p ∑X*f = 303+9*p
Mean of the data, X bar =
7.5 =
7.5(41 + p) = 303 + 9*p
307.5 + 7.5*p = 303 + 9*p
9*p - 7.5*p = 307.5 - 303
1.5*p = 4.5
p = 4.5/1.5 = 3
Therefore, value of p is 3 .