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

Class (seconds)	$13.8-14.0$	$14.0-14.2$	$14.2-14.4$	$14.4-14.6$	$14.6-14.8$	$14.8-15.0$
Frequency	$2$	$4$	$5$	$71$	$48$	$20$

Class	$0-10$	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$	$60-70$	$70-80$
Frequency	$2$	$6$	$8$	$x$	$20$	$18$	$y$	$14$

Age (in years)	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$	$60-70$
Number of patients	$60$	$42$	$55$	$70$	$53$	$20$

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 times,in seconds,taken by $150$ athletes to run a $110\, m$ hurdle race are tabulated below:

Class (seconds) $13.8-14.0$ $14.0-14.2$ $14.2-14.4$ $14.4-14.6$ $14.6-14.8$ $14.8-15.0$

Frequency $2$ $4$ $5$ $71$ $48$ $20$

The number of athletes who completed the race in less than $14.6\, s$ is:

The median of the following frequency distribution is $49$ and the total frequency is $100$. Find the missing frequencies $x$ and $y$.

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

Frequency $2$ $6$ $8$ $x$ $20$ $18$ $y$ $14$

For some given data,if $M = 62.5$ and $\bar{x} = 64$,then $Z = \ldots$

In the formula $Z = l + \left( \frac{f_{1} - f_{0}}{2f_{1} - f_{0} - f_{2}} \right) \times c$ for the mode,$f_{2} = \ldots \ldots \ldots$

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