Stats & Probability (7.7 SP)
To monitor the buffalo population, scientists put a special mark on 67 buffalo. Later, they flew over the area and kept track of the buffalo they saw. They counted a total of 340 buffalo, 34 of which were marked. To the nearest whole number, what is the best estimate for the buffalo population?
680
Jane drew a scale drawing of a neighborhood park. The scale she used was 1 inch : 3 yards. If the actual length of a soccer field in the park is 93 yards, how long is the field in the drawing?
31 inches.
Is 70 - (-22) negative or positive?
Positive
What is the value of n in the equation below? 2n + 1 = 21
n = 10
Are the ratios 1/2 and 12/24ths a proportion?
Yes
Jared bought 6 toys for his dog. They cost $2.00, $3.50, $2.50, $5.00, $4.00, and $5.50.
What is the mean price of the toys?
$3.75 is the mean price of the toys.
Can a triangle have sides such that a=2, b=5, and c=6.
Yes.
(why? Because a + b > c)
Is 6 - 47 positive or negative?
Negative
If there are 6 blue saucers for every 8 blue cups, and there are 7 pink saucers for every 10 pink cups. Are these ratios a proportion?
No
You have 3 cards, a King, a Queen, and a Jack. If you draw one at random, what is the probability that you will draw the Queen?
1/3 or 33%.
The diameter of a circle is 2 inches. What is the circle's radius?
1 inch.
9 5/7 + 2 1/7 =
11 6/7
What is the value of the expression? 2 + 3 x 3 + | –4 |
15
If Carter gets 4 cookies for practicing the piano for 2 hours, 8 cookies for 4 hours of practice, and 12 cookies for 6 hours of practice, what is the constant of proportionality.
2
A bag has 3 red and 3 blue marbles inside. Desmond reaches in and draws out a marble, putting that one in his pocket, he reaches in and draws another. Are these two events dependent or independent.
The two draws are Dependent events.
What are complementary angles?
2 angles less than 90 degrees that when added together equal 90 degrees.
Beth can rake and fill 1.9 bags of leaves each hour. How many bags of leaves will Beth rake and fill in 8 hours?
15.2 bags of leaves
Mario is in charge of providing punch for the class party.
To make the punch, Mario combines 4 liters of water and 12 scoops of punch mix. Write the equation for the relationship between x and y.
y = 3x
Braden is buying a new set of DJ equipment. Braden can afford one mixer and one turntable, and is trying to decide among 3 different mixers and 3 different turntables. How many different sets of DJ equipment can Braden buy?
9 sets.
You have a brick that is 8 inches long by 4 inches wide by 2 inches thick. What is the volume of the brick?
64 cubic inches.
A fancy restaurant put out small dishes of butter at each table. They divided 1/2 of a pound of butter evenly and filled 4 dishes. How much butter did they put in each dish?
(expressed in ounces)
2 ounces
Kitchen tables that were once selling for $164 are now selling for $123. What is the discount, as a percentage?
25%