The number of emails a friend received each day over the last 20 days is shown below. Create a cumulative frequency table that represents the data. For how many days did she receive 19 or fewer emails?
15 22 18 9 32 35 14 10 34 45 21 25 6 12 7 14 16 20 5 37.
Create a cumulative frequency table and find the number of days for which she recieve 19 or fewer emails.
Answer to Problem 3STP
11 days
Explanation of Solution
Given:
The data is :
The number of emails a friend received each day over the last 20 days is :
15,22,18,9,32,35,14,10,34,45,21,25,6,12,7,14,16,20,5,37
Calculation:
Arrange the data in increasing order:
5,6,7,9,10,12,14,14,15,16,18,20,21,22,25,32,34,35,37,45
Draw a frequency table and cumulative frequency of the frequency of Emails:
Emails | Frequency | Cumulative frequency |
0-9 | 4 | 4 |
10-19 | 7 | 11 |
20-29 | 4 | 15 |
30-39 | 4 | 19 |
40-49 | 1 | 20 |
From the cumulative frequency, we have that for 11 days , she had 19 or fewer emails.
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