Question

wachesaw manufacturing incorporated produced the following number of units in the last 16 days.
27 27 27 28 27 25 25 28
26 28 26 28 31 30 26 26
the information is to be organized into a frequency distribution.
click here for the excel data file
required:
a. how many classes would you recommend?
number of classes
b. what class interval would you suggest?
note: round your answer to 1 decimal place.
class interval

Explanation:

Step1: Find number of classes

Use $2^k \geq n$, where $n=16$.
$2^4=16$, so $k=4$.

Step2: Calculate class interval

First find range: $\text{Max}-\text{Min}=31-25=6$.
Interval formula: $\frac{\text{Range}}{k}=\frac{6}{4}=1.5$.

Answer:

a. 4
b. 1.5