CBSE Class 11-science Answered
please use the formula ∑fi|xi-x¯|/∑fi in Q1
Q2) find the image point (3,8) in the line x+3y-7=0.
Asked by Suryavanshikatoch | 14 Feb, 2019, 09:33: AM
Expert Answer
Let us calculate the mean of given data
income |
mid-value
xi
|
No. of persons
fi
|
xi fi |
0-100 | 50 | 4 | 200 |
100-200 | 150 | 8 | 1200 |
200-300 | 250 | 9 | 2250 |
300-400 | 350 | 10 | 3500 |
400-500 | 450 | 7 | 3150 |
500-600 | 550 | 5 | 2750 |
600-700 | 650 | 4 | 2600 |
700-800 | 750 | 3 | 2250 |
we have
income |
mid-value
xi
|
deviation
xi -
|
No. of persons
fi
|
(xi -)fi |
0-100 | 50 | -308 | 4 | -1232 |
100-200 | 150 | -208 | 8 | -1664 |
200-300 | 250 | -108 | 9 | -972 |
300-400 | 350 | -8 | 10 | -80 |
400-500 | 450 | 92 | 7 | 644 |
500-600 | 550 | 192 | 5 | 960 |
600-700 | 650 | 292 | 4 | 1168 |
700-800 | 750 | 392 | 3 | 1176 |
we have
mean deviation about mean = 0
Answered by Thiyagarajan K | 14 Feb, 2019, 03:59: PM
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