Question

Class size and class mark of the class interval 130-170

Answer 1

Answer:

The class size is the difference between the true upper limit and true lower limit

Step-by-step explanation:

so the class mark =170-130

=40

Answer 2

Given : Class interval 130 - 170

To Find : Class size and class mark

Solution:

Class size or Class width is the span between two consecutive lower class limits, calculated as their difference.

or Class Size is the difference between upper boundary - lower boundary of class interval

The class boundary is the number that closes the gap between the upper limit of one class and the lower limit of the following class.

It is the value exactly halfway between those two limits.

As only one class interval is given so assuming

that class limit and boundaries are equal

Hence  Class Size  = 170 - 130  = 40

Class Mark  or  Class Midpoint

Class midpoint is the middle value of a certain class. It is determined as the arithmetic mean of the lower and upper limit of the class.

Class Marks = ( 130 + 170)/2  = 150

Class Marks is 150

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