New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 6

EASY

7th ICSE

IMPORTANT

Earn 100

The heights of $17$ girls were measured ( in cm ) and the results were as follows:

$143, 148, 135, 150, 128, 139, 149, 146, 132, 151, 142, 144, 156, 140, 136, 142, 133 .$

What is the height of the shortest girl?

Important Questions on Frequency Distribution and Mean

EASY

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 6

The heights of $17$ girls were measured ( in cm ) and the results were as follows:

$143, 148, 135, 150, 128, 139, 149, 146, 132, 151, 142, 144, 156, 140, 136, 142, 133 .$

How many girls have height $140 cm$ or more?

MEDIUM

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 6

The heights of $17$ girls were measured ( in cm ) and the results were as follows:

$143, 148, 135, 150, 128, 139, 149, 146, 132, 151, 142, 144, 156, 140, 136, 142, 133 .$

Find the mean height?

MEDIUM

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 7

If the mean of

16, 14, x, 23, 20

is

18,

find the value of

x

.

MEDIUM

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 8

If the mean of

x, x + 2, x + 4, x + 6, x + 8

is

24,

find

x

.

MEDIUM

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 9

Renu scored

73, 86, 78

and

75

marks in four tests. What is the least number of marks she can score in her next test, if she has to have a mean score of minimum

80

marks in five tests?

HARD

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 10

Find the mean of the following frequency distributions: (Use the formula mean = $\frac{\sum_{} f x}{\sum_{} f}$ )

$x$	$4$	$8$	$10$	$12$
$f$	$3$	$2$	$5$	$4$

HARD

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 11

Find the mean of the following marks obtained by students of a class.

Marks	$15$	$20$	$25$	$30$	$35$	$40$
Number of Students	$9$	$7$	$12$	$14$	$15$	$6$

HARD

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 23 - Frequency Distribution and Mean>Exercise>Q 12

Find the mean of the following data:

$x$	$4$	$12$	$20$	$28$	$36$
$f$	$6$	$7$	$10$	$8$	$9$