1. The stem-and-leaf plot at the right below shows the scores for a 100-point unit exam in science class. NOTE: 7|2 represents a score of 72.

1. What were the highest and lowest scores on this test?
2. Which score occurred most frequently?
3. In which 10-point interval did most of the students score?
4. How many students received a score of 70 or better?
5. How many students received a score less than 70?

2. Each number below represents the age of a worker at Fred's Fast Food.

20  52  21  39  40  58  27  48  36  20  51  26  45  30  49  22  59  50  33  35  28  43  55  20

1. Make a stem-and-leaf plot of the data. Use the space provided.
2. How many people work a Fred's Fast Food?
3. What is the difference in the ages between the oldest and the youngest workers and older than 35 years?
4. What is the most common age for a worker?
5. Which age group is most widely represented?
6. How many workers are older than 35 years?

3. Each number below represents round lots of XXYZ stock traded each day over a 28-day period.

814  722  144  413  812  118  214  533  219  254  183  733  624  121 
325  166  722  766  814  723  325  445  388  239  357  746  537  155

1. Make a stem-and-leaf plot of the data in the space provided. Round numbers of shares to the nearest ten's position.
2. How many times were more than 300 round lots of stock traded?