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141
Total
Deviation
.
each prize
(D) The following table shows the area of houses of so families in a cit

By Autumn

141
Total
Deviation
.
each prize
(D) The following table shows the area of houses of so families in a city
Area of house
No. of families Class – mark of C.I.
in sq. meter
d=x-a
Classinterval)
40-45
15 – 50
5
50 – 55
7
60 – 65
5
65 – 70
10
If = 50
Total
Ifidi
Taking the class-mark (denoted by ‘a’) of the interval 50 – 55 as the ‘assumed mean, rewrite and
complete the table, and also find the mean of the data.​

About the author
Autumn

rewrite ninety six crore eighty lakh five thousand eight hundred twelve using the international place value system​

6. If a, ß are the roots of the equation x² + x-15=0 then
C+B
a
a’+B-
1) 15
2) 225
3) -15
4)1/1

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