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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 9

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In a grouped frequency distribution, the mid-values of the classes are used to measure which of the following central tendency?

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Important Questions on Statistics

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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 10

In the formula:

\bar{x} = a + \frac{\sum_{}^{} f_{i} d_{i}}{\sum_{}^{} f_{i}}

for finding the mean of the grouped data,

d_{i}' s

are deviations from

a

(assumed mean) of

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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 11

In the formula:

\bar{x} = a + h (\frac{\sum_{}^{} f_{i} u_{i}}{\sum_{}^{} f_{i}})

, for finding the mean of grouped frequency distribution,

u_{i} =

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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 12

While computing mean of grouped data, we assume that the frequencies are

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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 13

If

x_{i}

's are the mid-points of the class intervals of grouped data,

f_{i}

's are the corresponding frequencies and

\bar{x}

is the mean, then

\sum_{}^{} f_{i} (x_{i} - \bar{x})

is equal to

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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 14

Construction of a cumulative frequency distribution table is useful in determining the

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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 15

The times, in seconds taken by $150$ athletes to run a $110 m$ hurdle race are tabulated below:

Class	$13.8 - 14$	$14 - 14.2$	$14.2 - 14.4$	$14.4 - 14.6$	$14.6 - 14.8$	$14.8 - 15$
Frequency	$2$	$4$	$5$	$71$	$48$	$20$

The number of athletes who completed the race in less than $14.6$ seconds is

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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 16

Consider the following frequency distribution:

Class	$0 - 5$	$6 - 11$	$12 - 17$	$18 - 23$	$24 - 29$
Frequency	$13$	$10$	$15$	$8$	$11$

The upper limit of the median class is

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CBSE Syllabus Standard Mathematics for Class X>Chapter 15 - Statistics>Multiple Choice Questions>Q 17

Daily wages of a factory workers are recorded as:

Daily wages (in $₹$ )	$131 - 136$	$137 - 142$	$143 - 148$	$149 - 154$	$155 - 160$
Number of workers	$5$	$27$	$20$	$18$	$12$

The lower limit of the modal class is

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