In a maths test taken by 40 students,the aver | vedclass

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Question

(B) The average score of a group is calculated by dividing the total sum of scores by the total number of students.Total score of $30$ boys = $30 	im

Vedclass · Accepted Answer

$\frac{(30 	imes 16)+(10 	imes 12)}{30+10}$

Vedclass · Answer

(B) The average score of a group is calculated by dividing the total sum of scores by the total number of students.Total score of $30$ boys = $30 	imes 16 = 480$.Total score of $10$ girls = $10 	imes 12 = 120$.Total score of the whole class = $480 + 120 = 600$.Total number of students = $30 + 10 = 40$.Average score of the whole class = $\frac{	ext{Total score}}{	ext{Total students}} = \frac{480 + 120}{40} = \frac{(30 	imes 16) + (10 	imes 12)}{30 + 10}$.Thus,the correct expression is $\frac{(30 	imes 16) + (10 	imes 12)}{30 + 10}$.

Daily income (in Rs.)	$100-120$	$120-140$	$140-160$	$160-180$	$180-200$
Number of workers	$12$	$14$	$8$	$6$	$10$

Class	$15-35$	$35-55$	$55-75$	$75-95$	$95-115$
Frequency	$17$	$f_1$	$32$	$f_2$	$19$

Class	$0-10$	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$	$60-70$	$70-80$
Frequency	$2$	$4$	$10$	$20$	$18$	$20$	$16$	$10$

Class	$0-4$	$4-8$	$8-12$	$12-16$	$16-20$	$20-24$	$24-28$	$28-32$	$32-36$
Frequency	$6$	$8$	$17$	$23$	$16$	$15$	$f$	$4$	$3$

In a maths test taken by $40$ students,the average score of $30$ boys is $16$ and the average score of $10$ girls is $12$. Which of the following gives the average score of the whole class?

Similar Questions

The following distribution gives the daily income of $50$ workers of a factory.
Daily income (in Rs.) $100-120$ $120-140$ $140-160$ $160-180$ $180-200$
Number of workers $12$ $14$ $8$ $6$ $10$

Convert the distribution above to a less than type cumulative frequency distribution,and draw its ogive.

The mean of the following frequency distribution is $65$ and the total frequency is $100$. Find the missing frequencies $f_{1}$ and $f_{2}$.

Class $15-35$ $35-55$ $55-75$ $75-95$ $95-115$

Frequency $17$ $f_1$ $32$ $f_2$ $19$

Find the mean of the following frequency distribution:

Class $0-10$ $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$ $70-80$

Frequency $2$ $4$ $10$ $20$ $18$ $20$ $16$ $10$

In a maths test taken by $35$ students,the average score of $15$ girls is $10$ and that of $20$ boys is also $10$. Which of the following can be calculated based on the data we have?

The mean of the following data is $16.$ Find the missing frequency $f.$

Class $0-4$ $4-8$ $8-12$ $12-16$ $16-20$ $20-24$ $24-28$ $28-32$ $32-36$

Frequency $6$ $8$ $17$ $23$ $16$ $15$ $f$ $4$ $3$

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