Answer:
0.2177;
29;
170
Explanation:
Relative frequency is the expression, in decimal, of the number of times a particular response or answer occurs in the chart.
Relative frequency = frequency of a response ÷ total number of people in the sample
Cumulative frequency, on the other hand is simply the accumulated sum of all previous frequencies plus that of the current row.
In the table given, the first row says:
37 people (frequency), out of 170 people have 0 siblings.
Relative frequency = 37/170 = 0.2177
Third row:
The frequency of those who responded that they have 2 siblings can be gotten by simply multiplying the relative frequency by 170 = 0.1706*170 = 29
Last row:
The cumulative frequency will give us the total people surveyed. Thus: 31 + 139 = 170