Find the class marks of classes $30 - 35, 35 - 40$ and $40 - 45$ in the data below:
Marks Number of student
$30 - 35$ $5$
$35 - 40$ $8$
$40 - 45$ $15$
$45 - 50$ $20$
$50 - 55$ $5$
$55 - 60$ $4$
$60 - 65$ $4$
$65 - 70$ $2$
$70 - 75$ $3$

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Solution

Marks Number of student
30-35 5
35-40 8
40-45 15
45-50 20
50-55 5
55-60 4
65-70 2
70-75 3

Class mark = $\frac{u p p e r l i m i t + l o w e r l i m i t}{2}$
for 30-35 = $\frac{30 + 35}{2} = 32.5$
for 35-40 = $\frac{35 + 40}{2} = 37.5$
for 40-45= $\frac{40 + 45}{2} = 42.5$

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Similar questions

Marks	20−25	25−30	30−35	35−40	40−45	45−50	50−55	55−60	60−65	65−70
Students	6	3	7	4	6	4	2	8	3	7

30

Weight (in kg)	$40 - 45$	$45 - 50$	$50 - 55$	$55 - 60$	$60 - 65$	$65 - 70$	$70 - 75$
No. of students	$2$	$3$	$8$	$6$	$6$	$3$	$2$

Age	$20 - 25$	$25 - 30$	$30 - 35$	$35 - 40$	$40 - 45$	$45 - 50$	$50 - 55$	$55 - 60$	$60 - 65$	$65 - 70$
Cf	$21$	$40$	$90$	$130$	$146$	$166$	$176$	$186$	$195$	$199$

:

Marks	$50 - 55$	$55 - 60$	$60 - 65$	$65 - 70$	$70 - 75$
Students	$50$	$40$	$30$	$20$	$10$

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