Rohit collected the data regarding the weights of students in his class and prepared the following table: A student is to be selected randomly from his class for some competition. The probability of selection of the student is highest whose weight is in the interval.
Weight (in kg)
44 – 47
48 – 51
52 – 55
56 – 60
Number of Students
3
5
25
7

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Solution

A student is to be selected randomly from his class for some competition.
The probability of selection of the student is highest whose weight is in the interval
Because more number of students come under this interval
Thus, $52 - 55 .$ is required interval

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Q. Fill in the blanks
Question 31
Rohit collected the data regarding weights of students of his class and prepared the following table:

\begin{matrix} W e i g h t (i n k g) & 44 - 47 & 48 - 51 & 52 - 55 & 56 - 59 N u m b e r o f s t u d e n t s & 3 & 5 & 25 & 7 \end{matrix}

A student is to be selected randomly from his class for some competition. The probability of selection of the student is highest whose weight is in the interval ___.

Q. Collect the data of weights of students in your class. prepare a grouped frequency distribution table.

Q. The weights (in kg) of 30 students of a class are
39, 43, 32, 37, 29, 26, 31, 45, 46, 31, 37, 38, 30, 39, 36, 41, 35, 34, 41, 46, 39, 38, 36, 38, 40, 42, 33, 43, 44, 33.
Prepare a frequency distribution table using one class interval as 30–35, in which 30 is included and 35 excluded. Using the above data. draw a histogram.

Q. Do the following activity -
Activity I : Total number of students in your class, n(S) =

x

Number of students from your class, wearing spectacles, n(A) =

x

Probability of a randomly selected student wearing spectacles, P(A) =

x

Probability of a randomly selected student not wearing spectacles, P(B) =

x

Activity II : Decide the sample space yourself and fill in the following boxes.

Question 95(ii)

The weights (in kg) of 30 students of a class are as follows :
39, 38, 36, 38, 40, 42, 43, 44, 33, 33, 31, 45, 46, 38, 37,
31, 30, 39, 41, 41, 46, 36, 35, 34, 39, 43, 32, 37, 29, 26
Prepare a frequency distribution table using one class interval as (30-35), 35 not included.
Which class has the maximum frequency ?

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Weight (in kg)	44 – 47	48 – 51	52 – 55	56 – 60
Number of Students	3	5	25	7

A student is to be selected randomly from his class for some competition. The probability of selection of the student is highest whose weight is in the interval Because more number of students come under this intervalThus, 52–55. is required interval

A student is to be selected randomly from his class for some competition.
The probability of selection of the student is highest whose weight is in the interval
Because more number of students come under this interval
Thus, $52 - 55 .$ is required interval