40,60,80,100,120,140,160,180,200 are the class boundaries.
The lower class boundary (LCB) is the LCL minus one-half the tolerance, and the upper class boundary (UCB) is the UCL plus one-half the tolerance. Class borders are the end points of an open interval that contains the class interval.
given that
8 classes for n = 75measurements
minimum value = 40
maximum value = 195
from the question
smallest class boundary = (maximum - minimum value) / n classes
= (195 - 40) / 75 = 19.375 = 20
round off the value means 20
using minimum value and smallest class boundary.
Hence, the 40,60,80,100,120,140,160,180,200 are the class boundaries.
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Disclaimer: the question is incomplete on portal. Here is the complete question.
Question: Use the information given to find a convenient class width. Then list the class boundaries that can be used to create a relative frequency histogram. (Round your class width up to the nearest multiple of 5. Use the minimum value as the smallest class boundary. Enter your class boundaries as a comma separated list.)
8 classes for n = 75 measurements; minimum value = 40; maximum value = 195.
