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stira [4]
3 years ago
7

If the class mark and class size of the class

Mathematics
1 answer:
Gemiola [76]3 years ago
7 0

Answer:

The class interval is: 20-30

Step-by-step explanation:

Let l be the lower class limit and u be the upper class limit.

Then according to given statement that class mark is 25

\frac{l+u}{2} = 25\\l+u = 50\ \ \ Eqn\ 1

And

Class size is 10

So, the second equation will be:

u-l = 10\ \ \ \ Eqn\ 2

Adding equation 1 and 2

l+u+u-l = 50+10\\2u = 60\\\frac{2u}{2} = \frac{60}{2}\\u = 30

Now putting u =30 in equation 1

l+u = 50\\l+30 = 50\\l = 50-30\\l = 20

A class interval is written in the form that lower limit comes first and upper limit comes second.

So,

20-30

Hence,

The class interval is: 20-30

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