1. what is the median of the following set of numbers?
48.4, 47, 43, 47, 43.6, 41.6, 45, 51.4, 38.6

hint: order the numbers from least to greatest first!

a. 48.4 b. 43.6 c. 45
2. each of the five math teachers are comparing the number of students in their homeroom classes. the number of boys and girls in each teachers’ classes are recorded in the table below.

hint: mean is the average.

which statement best describes the means of the two sets of data?

a. the mean number of girls in 7 times greater than the mean numbers of boys in the homeroom classes.

b. the mean number of girls is the same as the mean number of bboys in the homeroom classes.

c. the mean number of girls is 7 more than the mean number of boys in the homeroom classes.
3. which box-and-whisker plots below represents the data set below?

82, 127, 109, 111, 114, 126, 87, 91, 105, 102, 112, 121, 94, 95, 116

hint: order the numbers from least to greatest. the dots represent the lowest and highest numbers. the box represents the q1, median, and q3.

a. b.

c.

4. the following stem-and-leaf plot shows the on-record attendance for regional charity drive meetings.

key: 3|1 = 31

what is the mode of these values? hint: mode is the number that occurs most often!

a. 56 b. 74 c. 38

5. in a bag of keys, there are 14 silver keys, 6 black keys, 10 copper keys, and 2 painted keys of various colors. one key is drawn out at random. what is the probability that the key that is drawn is silver or copper?

a. 3/4 b. 5/16 c. 7/16

6. an experiment is broken up into two parts. in the first part of the experiment, a six-sided die is rolled. in the second part of the experiment, a dime is tossed in the air. what is the probability of getting a 2 and tails as the outcome?

hint: find the probability of each part separate, then multiply.

a. 1/6 b. 1/24 c. 1/12

7. an experiment consists of rolling two fair dice and adding the dots on the two sides facing up. what is the probability that the sum of the dots is 7 or 11?

a. 2/9

b. 5/18

c. 1/9

8. there are 5 yellow buttons, 2 green buttons, and 3 red buttons in a bag. find the following probabilities.

a. find the probability of pulling a yellow or red button?



b. find the probability of pulling a green button, then a red button with replacement.
hint: after you pull the green it is put back in the bag before the next one is drawn



c. find the probability of pulling a red button, then a yellow button without
replacement.
hint: once the red button is pulled, it is not put back into the bag leaving 1 less
button in the bag.