Math exam #4

1. Sandra can buy 8 ounces of Brand X cheddar cheese for $2.00 or 5 ounces of Brand
   Y cheddar cheese for $1.20. What are the unit prices of each? (X unit .25 cents Y unit .24 cents)
2. Gilbert drove five days last week, and 160 miles. He used 8 gallons of fuel and paid
   $24 for the fuel. a) How many miles per gallon did Gilbert get? 20 miles
   b) How many gallons per mile did his car use? 1/20 gallons
   c) How many miles per day did he average? 32 miles
   d) How much did he pay per gallon for his fuel? 3 dollars

3. Jack has 62 marbles. 14 are blue, 20 are red, and 28 are green.
a) What is the ratio of blue to green marbles in lowest terms? 1:2
b) What is the ratio of red to blue marbles in lowest terms? 10:7
c) What is the ratio of blue marbles to total marbles in lowest terms? 7:31

4. If Lauren runs a total of 75 miles in 30 days, how many miles will she run in 10
days? 25 miles

5. Find the statistical quantities below for the following set of data:
8, 17, 14, 11, 13, 8, 9, 18, 19
a) Mean

6. Jayden is working in a sporting goods store during the summer. On one day, he sold fishing reels, fishing lures, clothing, pocket knives. sales: fishing reels: 275 fishing lures: 150 clothing: 225 pocket knives: 100

7. Make a stem-and-leaf plot of the following data. Then find the minimum,
maximum, median, and mode or modes.
54, 54, 55, 57, 58, 59, 64, 69, 69, 71, 73, 74, 74, 74, 75, 77, 83, 86, 86, 87, 88, 90, 91, 94, 98 Minimum: 54

Maximum: 98

Median (middle value): 74 (since there are 25 data points, which is odd)

Mode(s): 74 (appears most frequently)

8. How many black cherry trees are less than 75 feet high? (answer 12) How many black cherry trees between 75 and 85 feet high? (answer 23)