I. Describe which measure of central tendencymean, median, or modewas probably used in each situation.

1. One-half of the factory workers make more than Php270 per hour, and one-half make less than Php270 per hour.

2. The average number of children per family in the Plaza Heights Complex is 1.8.

Mode 3. Most people prefer red convertibles over any other color.

4. The most common fear today is fear of speaking in public.

5. The average age of college professors is 42.3 years.

6. The values are to be divided into two approximately equal groups, one group containing the larger values and one containing the smaller values.

7. Further statistical computations will be needed.

8. The most typical case is desired.

9. There is an extreme value in the data set.

10. The data are categorical.

II. Given below the weekly transportation expenses of 15 school personnel,

96 192 300 420 600

720 840 432 336 456

468 510 522 570 810

Find the following (Show your complete solution if necessary):

1. Mean

2. 2

3. 6

4. 27

5. Percentile rank of the expenses 570

III. For each of the following, shade the normal curve and find the required area the curve lies:

1. Between z = 0 and z = 2.43