Question

18. Class mark of the 1st class interval is 5 and there are five classes. If the class
size is 10 then what is the last class interval?​

Answer 1

Answer:

0-10

10-20

20-30

30-40

40-50

are the class intervals

last one is 40-50

Answer 2

The last class interval = 40 - 50

Given :

• Class mark of the 1st class interval is 5 and there are five classes.
• The class size is 10

To find : The last class interval

Solution :

Step 1 of 3 :

Find Upper Class boundary

Here it is given that Class mark of the 1st class interval is 5

There are five classes.

The class size is 10

So Class Mark of five classes are 5 , 15 , 25 , 35 , 45

Thus class mark of last class interval

Upper Class boundary

$\sf{ = 45 + \dfrac{10}{2} }$

$\sf{ = 45 + 5 }$

$\sf{ = 50 }$

Step 2 of 3 :

Find Lower class boundary

Lower class boundary

$\sf{ = 45 - \dfrac{10}{2} }$

$\sf{ = 45 - 5 }$

$\sf{ = 40}$

Step 3 of 3 :

Find the last class interval

Hence the required last class interval is 40 - 50

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