Question

find the value of p if the mean of following is 40.4 : (x) 10,20,30,40,50,60,70. (f) 3,8,12,5,P,7,5

Answer 1

according to me the p is 10

Answer 2

Answer:

The value of P is 10.

Step-by-step explanation:

Given : Data mean = 40.4

To find : The value of P

Solution :

(x)  10    20     30     40     50      60      70

(f)   3      8        12       5        P         7       5

(fx) 30   160    360   200    50P    420   350

Mean of the data is

$M=\frac{\sum fx}{\sum f}$\

$40.4=\frac{30+160+360+200+50P+420+350}{3+8+12+5+P+7+5}$

$40.4=\frac{1520+50P}{40+P}$

$40.4\times (40+P)=1520+50P$

$1616+40.4P=1520+50P$

$9.6P=96$

$P=10$

Therefore, The value of P is 10.