Question

The class mark of the class 45 — 55 is _______
(a) 55
(b) 45
(c) 50
(d) 47.5

Answer 1

Answer:

The class mark of the class 45 _ 55 is 50.

Answer 2

Answer:

Option C is correct.

Step-by-step explanation:

Class Mark can be calculated by the formula shown below:

$class \: mark = \frac{upper \: class \: limit +lower \: class \: limit }{2}$

In the given class interval 45-55

Upper class limit =55

Lower class limit = 45

According to the formula

$class \: mark = \frac{55 + 45}{2} \\ \\ = \frac{100}{2} \\ \\ = 50$

Option C (50 ) is correct one.

Hope it helps you.