Q6 of 40 Page 210

The heights of boys and girls of IX class of a school are given below.

Compare the heights of the boys and girls


[Hint : Find median heights of boys and girls]


We have



We shall find median of the heights of the boys and girls separately.


Median of heights of boys:


Nxi = 37



⇒


Cumulative frequency = 19 falls in the height of 147 cm.


Thus, median height of boys is 147 cm.


Now, median of heights of girls:


Nyi = 29



⇒


Cumulative frequency = 15 falls in the height of 18.


Cumulative frequency, 18 falls in the height of 152 cm.


∴, Median height of boys is 147 cm whereas median height of girls in the class is 152 cm.


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Find arithmetic mean of school wise savings in each mandal. Also find the arithmetic mean of saving of all schools.


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 8

On the occasion of New year’s day a sweet stall prepared sweet packets. Number of sweet packets and cost of each packet are given as follows.





















Cost of packet (in ₹)



₹25



₹50



₹75



₹100



₹125



₹150



No of packets



20



36



32



29



22



11



Find the mean, median and mode of the data.