Consider the following data representing the price of refrigerators (in dollars): 1218, 1253, 1121, 1282, 1261, 1263, 1349, 1390, 1316, 1227, 1140, 1245, 1158, 1168, 1195, 1225, 1161, 1405, 1320, 1405, 1122. Step 7 of 7: Compute the cumulative frequency of the third class.

Answer

To find the cumulative frequency of the third class, we first need to determine the frequency of each of the first three classes and then sum them up. 1. Identify the first three classes: Class 1: 1108-1157, Class 2: 1158-1207, Class 3: 1208-1257. 2. Count the data points that fall into each class: For Class 1 (1108 to 1157): 1121, 1140, 1122. Frequency = 3. For Class 2 (1158 to 1207): 1158, 1168, 1195, 1161. Frequency = 4. For Class 3 (1208 to 1257): 1218, 1253, 1227, 1245, 1225. Frequency = 5. 3. Calculate cumulative frequency for the third class: The cumulative frequency is the sum of the frequencies of that class and all previous classes. Cumulative Frequency = Frequency(Class 1) + Frequency(Class 2) + Frequency(Class 3) = 3 + 4 + 5 = 12. Therefore, the cumulative frequency of the third class is 12.