Question

Question 9 A company manufactures car batteries of a particular type. The lives (in years) of 40 such batteries were recorded as follows: 2.6 3.0 3.7 3.2 2.2 4.1 3.5 4.5 3.5 2.3 3.2 3.4 3.8 3.2 4.6 3.7 2.5 4.4 3.4 3.3 2.9 3.0 4.3 2.8 3.5 3.2 3.9 3.2 3.2 3.1 3.7 3.4 4.6 3.8 3.2 2.6 3.5 4.2 2.9 3.6 Construct a grouped frequency distribution table for this data, using class intervals of size 0.5 starting from the intervals 2 − 2.5.

Class 9 - Math - Statistics Page 246"

Answer 1

Heya !


Here is your answer with the attachment.

Hope it helps !!!

Answer 2

When a data has a large number of values we condense it into groups. these grouping are called classes as 20-30, 30-40...

The least number of a class is called the lower class limit and the greatest number is called the upper class limit.

The number of entries of the data having their values lying in a class is defined as a frequency of the class.

The table in which the corresponding frequencies are written against each class is called a frequency distribution of given data.
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Solution:

i)
We condense the given data into groups like 2.0- 2.5, 2.5- 3.0 ......4.5- 5.0
(since our data is from 2.2 to 4.6) .

The class width in this case is 0. 5.

Now the given data can be condensed in tabular form as in the attachment.

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Hope this will help you.....