Question

plz any one solve the 3 question...its urgent for tmrws board exam plz no unnecessary answers...

Answer 1

$\bold{\boxed{\mathfrak{\red{Solution}}}}}}$

Given,

Mean of 5 numbers = 20.6

x : 10, 15, p, 25, 35

f : 3, 10, 25, 7, 5

Therefore,

fx = 30, 150, 25p, 175, 175

Σfx = 530 + 25p

N = 50

We know that,

Mean = Σfx / n

Putting the value of given mean, Σfx and n in their respective places.

20.6 = 530 + 25p/50

20.6 * 50 = 530 + 25p

1030 = 530 + 25p

1030 - 530 = 25p

500 = 25p

500/25 = p

So, p = 20

Verification of the answer :

Mean = Σfx / n

20.6 = 530 + 25*20 / 50

20.6 = 530 + 500 / 50

20.6 = 1030 / 50

20.6 = 20.6

So,

The value of p = 20...