Question

class
0-30
30-60
60-90
90-120
120-150
150-180
frequency
12
21
34
52
20
11​

Answer 1

Answer:

Class f

i

x

i

u

i

=

h

x

i

−A

u

i

2

f

i

u

i

f

i

u

i

2

0-30 2 15 -3 9 -6 18

30-60 3 45 -2 4 -6 12

60-90 5 75 -1 1 -5 5

90-120 10 105 0 0 0 0

120-150 3 135 1 1 3 3

150-180 5 165 2 4 10 20

180-210 2 195 3 9 6 18

Total 30 2 76

Here, N=30,h=30

Mean,

x

ˉ

=A+

N

∑

i=1

7

f

i

u

i

×h

=105+

30

2

×30

=105+2=107

Variance (σ

2

)=

N

2

h

2

⎣

⎢

⎡

N

i=l

∑

7

f

i

u

i

2

−(

i=l

∑

7

f

i

u

i

)

2

⎦

⎥

⎤

=

(30)

2

(30)

2

[30×76−(2)

2

]

=2280−4

=2276

Answer 2

Answer:

plzz write in a proper order or write it in a paper and upload

Explanation:

then next second i will edit my answer.