A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in $20$ houses in a locality. Find the mean number of plants per house.

Number of plants $0 - 2$ $2 - 4$ $4 - 6$ $6 - 8$ $8 - 10$ $10 - 12$ $12 - 14$

Number of houses $1$ $2$ $1$ $5$ $6$ $2$ $3$

Which method did you use for finding the mean, and why?

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Important Questions on Statistics

HARD

10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 3

Consider the following distribution of daily wages of $50$ workers of a factory.

Daily wages $(in ₹)$	$100 - 120$	$120 - 140$	$140 - 160$	$160 - 180$	$180 - 200$
Number of workers	$12$	$14$	$8$	$6$	$10$

Find the mean daily wages of the workers of the factory by using an appropriate method.

HARD

10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 4

Thirty women were examined in a hospital by a doctor and the number of heart beats per minute recorded and summarized as follows. Fine the mean heartbeats per minute for these women, choosing a suitable method.

Number of heartbeats per minute	$65 - 68$	$68 - 71$	$71 - 74$	$74 - 77$	$77 - 80$	$80 - 83$	$83 - 86$
Number of women	$2$	$4$	$3$	$8$	$7$	$4$	$2$

HARD

10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 5