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Frequency Table & Its Average

The relative ...

Question

The relative frequency of students working $9$ hours or less is

A

2

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B

40

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C

45

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D

Can not be determined from the information given.

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Solution

The correct option is B $40$
The relative frequency of students working $9$ hours or less lie in the $0 - 9$ hours group.
So, total number of students $= 40$ .

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Q. Consider the Rufus School activities-data shown below :

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Males	$20$	$2$	$8$	$10$	$40$
Females	$20$	$10$	$10$	$20$	$60$
Total	$40$	$12$	$18$	$30$	$100$

Prepare bivariate table with relative frequency.
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Q. The following data gives the information on the observed lifetimes (in hours) of

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electrical components:

Lifetimes (in hours)	$0 - 20$	$20 - 40$	$40 - 60$	$60 - 80$	$80 - 100$	$100 - 120$
Frequency	$10$	$35$	$52$	$61$	$38$	$29$

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We draw the histogram for above frequency table:
Answer the following:

How many students watched TV for less than 4 hours?

Q. The following information is regarding marks in English, obtained out of 80.

How many students obtained marks less than 40?

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