Question

number of students for 6, 8 ,10, 12 and frequency-4,8,a,11,3. If mean=80.5 find the value of a​

Answer 1

Step-by-step explanation:

Find the mean, using direct method:

Class 0-10 10-20 20-30 30-40 40-50

Frequency 3 5 9 5 3

ANSWER:

Class

Frequency (fi)

Mid Values (xi)

(fi×xi)

0-10

3

5

15

10-20

5

15

75

20-30

9

25

225

30-40

5

35

175

40-50

3

45