Question

Question 4 of 6, Step 4 of 49/14CorrectConsider the following data representing the price of plasma televisions (in dollars).1387, 1135, 1352, 1220, 1202, 1217, 1176, 1268, 1150, 1182, 1222, 1391, 1163, 1168, 1282, 1250, 1201, 1225, 1403, 1175, 1371Copy DataPricePlasma Televisions (in Dollars)ClassFrequencyRelative FrequencyCumulative Frequency1077-11361137-11961197-12561257-13161317-13761377-1436Step 4 of 4: Compute the cumulative frequency of the fourth class.AnswerTablesKeypad

Answer 1

There are 21 televisions.

Class 1077-1136:

The frequency is how many of them cost in this range.

There is 1.

So frequency: 1

Relative frequency is 1/21 = 0.0476

Cumulative frequency is the previous cumulative plus the relative:

Previous cumulative: 0

Relative: 0.0476

Cumulative = 0 + 0.0476 = 0.0476

Class 1137-1196:

6 in this interval.

Frequency: 6

Relative frequency: 6/21 = 0.2857

Previous cumulative: 0.0476

Relative: 0.2857

Cumulative = 0.0476 + 0.2857 = 0.3333

Class 1197-1256:

7 in this interval.

Frequency: 7

Relative frequency: 7/21 = 0.3333

Previous cumulative: 0.3333

Relative: 0.3333

Cumulative: 0.3333 + 0.3333 = 0.6666

Class 1257-1316:

2 in this interval.

Frequency: 2

Relative frequency: 2/21 = 0.0952

Previous cumulative: 0.6666

Relative: 0.0952

Cumulative: 0.6666 + 0.0952 = 0.7618

Class 1317-1376:

2 in this interval.

Frequency: 2

Relative frequency: 2/21 = 0.0952

Previous cumulative: 0.7618

Relative: 0.0952

Cumulative: 0.7618 + 0.0952 = 0.857

Class 1377-1436:

3 in this interval.

Frequency: 3

Relative frequency: 0.143

Previous cumulative: 0.857

Relative: 0.143

Cumulative: 0.857+0.143 = 1