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

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10th CBSE

IMPORTANT

Earn 100

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.

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Important Questions on Statistics

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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	$2$	$4$	$3$	$8$	$7$	$4$	$2$

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10th CBSE

IMPORTANT

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

Find the mean of each of the following frequency distribution:

Class intervals:	$0 - 6$	$6 - 12$	$12 - 18$	$18 - 24$	$24 - 30$
Frequency :	$6$	$8$	$10$	$9$	$7$

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10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 6

Find the mean of each of the following frequency distribution:

Class intervals:	$50 - 70$	$70 - 90$	$90 - 110$	$110 - 130$	$130 - 150$	$150 - 170$
Frequency :	$18$	$12$	$13$	$27$	$8$	$22$

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10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 7

Find the mean of each of the following frequency distribution:

Class intervals:	$0 - 8$	$8 - 16$	$16 - 24$	$24 - 32$	$32 - 40$
Frequency :	$6$	$7$	$10$	$8$	$9$

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10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 8

Find the mean of each of the following frequency distribution:

Class intervals:	$0 - 6$	$6 - 12$	$12 - 18$	$18 - 24$	$24 - 30$
Frequency :	$7$	$5$	$10$	$12$	$6$

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10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 9

Find the mean of each of the following frequency distribution:

Class intervals:	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$
Frequency :	$9$	$12$	$15$	$10$	$14$

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10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 10

Find the mean of each of the following frequency distribution:

Class intervals:	$0 - 8$	$8 - 16$	$16 - 24$	$24 - 32$	$32 - 40$
Frequency :	$5$	$9$	$10$	$8$	$8$

HARD

10th CBSE

IMPORTANT

MATHEMATICS CLASS X>Chapter 15 - Statistics>EXERCISE 15.3>Q 11

Find the mean of each of the following frequency distribution:

Class intervals:	$0 - 8$	$8 - 16$	$16 - 24$	$24 - 32$	$32 - 40$
Frequency :	$5$	$6$	$4$	$3$	$2$