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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	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$
Frequency	$12$	$16$	$8$	$6$	$8$

Marks	$0-10$	$10-20$	$20-30$	$30-40$	$40-50$
No. of students	$20$	$10$	$20$	$30$	$20$

Number of plants	$0-2$	$2-4$	$4-6$	$6-8$	$8-10$	$10-12$	$12-14$
Number of houses	$1$	$2$	$1$	$5$	$6$	$2$	$3$

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

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Calculate the mean of the following frequency distribution:

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In the formula $\bar{x} = a + \frac{\sum f_{i} d_{i}}{\sum f_{i}}$ for finding the mean of grouped data,$d_{i}$ are deviations from $a$ of:

Calculate the mean of the frequency distribution of the marks scored by $100$ students in a mathematics test:

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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.