7. A circular path whose circumference is 616 m, has path inside the park whose width is 14 m all around the park. Find the area of park excluding the path and also find the cost of grassing on it at the rate of 1.40 per m.
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Answer:
The weights in grams of 50 oranges picked at random from a consignment are as follows: 131,113,82,75,204,81,84,118,104,110,80,107,111,141, 136,123,90,78,90,115,110,98,106,99,107,84,76,186,82, 100,109,128,115,107,115,119,93,187,139,129,130,68, 195,123,125,111,92,86,70,126 Form the grouped frequency table by dividing the variable range into intervals of equal width, each corresponding to 20gms in such a way that the mid-value of the first class corresponds to 70 gms
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We know area of circle = pi * r ^ 2
Rightarrow22/7* r^ 2 =616
Rightarrow r^ 2 =(616*7)/22
Rightarrow r^ 2 =28*7
Rightarrow r= mathcal J (28*7)
Rightarrow r= mathcal d (2*2*7*7)
Rightarrow r=2*7
Rightarrow r=14 cm
Therefore, circumference of 3ircle = 2pi * r
=88 cm
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