Question

The marks of 35 students is given below . if their mean mark is 34 find the value of k and P. X : 10 20 30 40 50 60 F. : 4 K 8 P. 3. 4​

Answer 1

Step-by-step explanation:

Class Interval Frequency f

i

Mid-Value x

i

f

i

x

i

0−10 3 5 15

10−20 4 15 60

20−30 p 25 25p

30−40 3 35 105

40−50 2 45 90

∑f

i

=12+p ∑f

i

x

i

=270+25p

Mean =

∑f

i

∑f

i

x

i

Mean =24 (given)

⇒24=

(12+p)

(270+25p)

⇒24(12+p)=270+25p

or p=18