Question

Date
factorised
method

99x^2-202x + 99=0 ​

Answer 1

Step-by-step explanation:

ANSWER

No. of plants No. of houses (f

i

) Mid point (X

i

) f

i

x

i

0−2 1 1 1

2−4 2 3 6

4−6 1 5 5

6−8 5 7 35

8−10 6 9 54

10−12 2 11 22

12−14 3 13 39

Total 20 162

Calculating mean, we get

Mean,

x

ˉ

=

n

1

∑f

i

x

i

Here, n=20,∑f

i

x

i

=162

Therefore, Mean,

x

ˉ

=

20

162

=8.1 plants

We have used direct method because numerical values of f and x are small.