Question

*Will fan and Medal*
Year Number of Dropouts
1 7
2 8
3 6
4 6
5 6
6 4
7 4
8 1
9 2
10 7
11 6
12 1
13 1
14 1
15 3
16 3
17 5
18 4
19 5
20 7
The table gives 20 years of data on the number of students in a particular school who dropped out in the ninth grade. A sample is taken to include only the last 3 years of this data. With this information, calculate both the population mean and the sample mean for ninth-grade dropouts per year.

A) The population mean is 4.35. The sample mean is 5.33.
B) The population mean is 4.21. The sample mean is 5.33.

Answer 1

C) The population mean is 5.33. The sample mean is 3.75.

D) The population mean is 5.33. The sample mean is 4.21.

Answer 2

first calculate the population mean by taking the mean of all 20 numbers

Answer 3

4.35?

Answer 4

good, now take the mean of the last 3 numbers to find the sample mean

Answer 5

4+5+7 divided by what?

Answer 6

16/3? so 5.3?

Answer 7

yes

Answer 8

Yes so A is correct