The following is the frequency distribution of waiting time at A centre; draw histogram to represent the data.
Waiting time(in seconds)
Number of Customers
$0 - 30$
$5$
$30 - 60$
$50$
$60 - 90$
$64$
$90 - 120$
$23$
$120 - 150$
$15$

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Solution

Given the distribution of number of customers in respective waiting times.

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Calculate mean, variance and standard deviation for the following frequency distribution:

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Classes	0-30	30-60	60-90	90-120	120-150	150-180	180-210
Frequencies	2	3	5	10	3	5	2

Find the mean and variance for the following frequency distribution.

$\begin{matrix} Class & 0 - 30 & 30 - 60 & 60 - 90 & 90 - 120 & 120 - 150 & 150 - 180 & 180 - 210 Frequencies & 2 & 3 & 5 & 10 & 3 & 5 & 2 \end{matrix}$

Q. Draw a histogram and frequency polygon to represent the following data.

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Q. 7. Classes 0-30 30-60 60-90 90-120 120-150 150-180 180-210Frequencies 23510

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Waiting time(in seconds)	Number of Customers
$0 - 30$	$5$
$30 - 60$	$50$
$60 - 90$	$64$
$90 - 120$	$23$
$120 - 150$	$15$

The following is the frequency distribution of waiting time at A centre; draw histogram to represent the data.Waiting time(in seconds)Number of Customers0−30530−605060−906490−12023120−15015

Given the distribution of number of customers in respective waiting times.

The following is the frequency distribution of waiting time at A centre; draw histogram to represent the data.
Waiting time(in seconds)
Number of Customers
$0 - 30$
$5$
$30 - 60$
$50$
$60 - 90$
$64$
$90 - 120$
$23$
$120 - 150$
$15$