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(C) To find the mean,we first make the class intervals continuous by subtracting $0.5$ from the lower limit and adding $0.5$ to the upper limit. Then

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$26$

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(C) To find the mean,we first make the class intervals continuous by subtracting $0.5$ from the lower limit and adding $0.5$ to the upper limit. Then we calculate the mid-value $(x_i)$ for each class.						Class Interval			Mid Value $(x_i)$			Frequency $(f_i)$			$f_i x_i$							$15.5-18.5$			$17$			$1$			$17$							$18.5-21.5$			$20$			$3$			$60$							$21.5-24.5$			$23$			$4$			$92$							$24.5-27.5$			$26$			$9$			$234$							$27.5-30.5$			$29$			$13$			$377$							Total			-			$\Sigma f_i = 30$			$\Sigma f_i x_i = 780$			The mean is calculated using the formula: $\bar{x} = \frac{\Sigma f_i x_i}{\Sigma f_i}$.$\bar{x} = \frac{780}{30} = 26$.Thus,the mean number of pages written per day is $26$.

Number of pages written per day	$16-18$	$19-21$	$22-24$	$25-27$	$28-30$
Number of days	$1$	$3$	$4$	$9$	$13$

Class	Frequency $(f)$
$110-120$	$6$
$120-130$	$25$
$130-140$	$48$
$140-150$	$72$
$150-160$	$116$
$160-170$	$60$
$170-180$	$38$
$180-190$	$22$
$190-200$	$3$

Class	$0-10$	$10-20$	$20-30$	$30-40$	$40-50$
Frequency	$7$	$16$	$25$	$32$	$20$

Class	$0-5$	$5-10$	$10-15$	$15-20$	$20-25$
Frequency	$10$	$15$	$12$	$20$	$9$

The following table gives the number of pages written by Sarika for completing her own book over $30$ days:

Number of pages written per day $16-18$ $19-21$ $22-24$ $25-27$ $28-30$

Number of days $1$ $3$ $4$ $9$ $13$

Find the mean number of pages written per day.

Similar Questions

Find the median of the following frequency distribution:

Class Frequency $(f)$

$110-120$ $6$

$120-130$ $25$

$130-140$ $48$

$140-150$ $72$

$150-160$ $116$

$160-170$ $60$

$170-180$ $38$

$180-190$ $22$

$190-200$ $3$

For the following data,the modal class is .... .
Class $0-10$ $10-20$ $20-30$ $30-40$ $40-50$
Frequency $7$ $16$ $25$ $32$ $20$

If $Z+M=34$ and $M+\bar{x}=40,$ then $M=\ldots \ldots \ldots . . .$

For the following distribution:

Class $0-5$ $5-10$ $10-15$ $15-20$ $20-25$

Frequency $10$ $15$ $12$ $20$ $9$

the sum of the lower limits of the median class and the modal class is:

For a given frequency distribution,$A = 450, c = 100, \Sigma f_{i} u_{i} = -20$ and $\Sigma f_{i} = 20$. Then,the mean $\bar{x} = \ldots$

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The following table gives the number of pages written by Sarika for completing her own book over $30$ days: Number of pages written per day $16-18$ $19-21$ $22-24$ $25-27$ $28-30$ Number of days $1$ $3$ $4$ $9$ $13$ Find the mean number of pages written per day.