Answer:
a) 4.60 (2 dp)
b) 1.31 (2 dp)
c) 8.8
Step-by-step explanation:
The "Frequency" part of a frequency table is the measure of how often the data value occurs.
To calculate the mean of data presented in a frequency table, we need to multiply each data value by its given frequency, sum these, then divide by the sum of the frequency.
The formula for mean is:
<h3><u>Part (a)</u></h3>
Add a row showing the values of
Add a column showing the totals of and
Now use the formula to calculate the mean:
<h3><u>Part (b)</u></h3>
Add a column showing the values of
Add a row showing the totals of and
Now use the formula to calculate the mean:
<h3><u>Part (c)</u></h3>
Add a column showing the values of
Add a row showing the totals of and
Now use the formula to calculate the mean: