Question

5. Following data gives age of 100 students in
a school. Calculate variance and standard deviation
13
14
Age (In years) 10/11 12
No. of Students 10 | 20 40
20
10​

Answer 1

Answer:

ANSWER

Class inreval

Mid values (x

i

)

Frequency (f

i

)

d

i

=x

i

−A

u

i

=

h

d

i

F

i

u

i

0-10

5

4

-20

-2

-8

10-20

15

6

-10

-1

-6

20-30

25=A

10

0

0

0

30-40

35

20

10

1

20

40-50

45

10

20

2

20

N=50

Total=26

h=10,A=25,N=50,∑f

i

u

i

=26

Mean (

x

)=A+h[

N

1

∑f

i

u

i

]

put the values

Mean=30.2

Step-by-step explanation:

Ayush