Question below with chart

Question

The number of days it takes to receive a delivery from an online retailer for 16 customers is given below. Construct a frequency table for grouped data using 5 classes.  

1,1,1,2,2,3,3,3,3,3,4,4,6,8,12,13

Provide your answer below:

Lower Class LimitUpper Class LimitFrequency
1
	6
7	9	1
		1
13	15

Answer 1

First you will need to made a table with three columns...The first column will be a list of unique values from your list

where for the string of number you gave: 1,1,1,2,2,3,3,3,3,3,4,4,6,8,12,13

the unique values are: 1, 2, 3, 4, 6, 8, 12, 13

next to count how many times the unique numbers appear in the string

1 is listed 3 times

2 is listed 2 times

etc.

So now we can make the table

Unique Frequency

1 3

2 2

-----------------------

3 5

4 2

-----------------------

6 1

-----------------------

8 1

-----------------------

12 1

13 1

To determine the range for each interval, you first find the range

Range = 13-1 (highest value - lowest value) = 12

The number of class intervals = range / width

where

number of class intervals = 5

range = 12

width = ?

which can be solved to determine the width

width = range / number of class intervals = 12 / 5 = 2.4 (round up) = 3

We can now determine the width for each class interval

Bin number Class interval Frequency

1 1 - 3 3+2=5

2 4 - 6 5+2=7

3 7 - 9 1

4 10 - 12 1

5 13 - 15 2