sampling
An airline company wants to survey its passengers for customer satisfaction. They randomly select 6 flights and survey each passenger. What kind of sample is this?
A. Stratified
B. Cluster random sample
C. Simple random sample
D. None of the above^
B.Cluster random sample
Suppose you have a six sided die, what is the probability of rolling an even number?
A. 2/4
B. 3/6
C. 1/4
D. 1/2
D. 1/2
Find the midpoint of BD if B is (-8, 4) and D is (6, 2)
(-1, -1)
suppose a lighthouse operator can see a sailboat using a telescope through a window. The angle of depression is 3 degrees, if the top of the boat is known to be 20m away find the distance between the boat and lighthouse
x = 1.05
John is leaving school to go to a party. He walks 6 blocks north and 8 blocks west. How far is John from the school?
8^2 + 6^2 = 64 + 36
C = square root of 100
C = 10
An ice cream shop surveys it’s employees for effectiveness by grouping the managers and cashiers separately to question them. what kind of sample is this?
A. Stratified random
B. Simple random
C. Cluster
D. None of the above
A. Stratified random
Suppose you have a six sided die, what is the probability of rolling an odd number?
A. 3/6
B. 1/2
C. 3/4
D. 1/4
B. 1/2
M is the midpoint of AB, what is the coordinate B if A is (3, 7) and the midpoint is (5, 10)
A. 2, 10
B. 3, 6
C. 7, 13
D. 6, 12
C. 7, 13
the angle of elevation from the sun to a building is 38 degrees and it casts a shadow that is 21m long. How high is the building?
(tan38/1) = (x/21)
21tan38 = x
x = 16.4
the foot of a ladder is placed 24 inches from a wall and the top of the ladder rests 45 inches up the wall. How tall is the ladder
252 + 452 = x2
576+2025 = x2
2601 = x
square root of 2601 = x
x = 51
Sara wants to see how many of her friends like cats better than dogs so she surveys her math class first thing in the morning. What kind of sample is this?
A. Cluster
B. Simple Random
C. Convenience
D. Stratified
C. Convenience
A. 1/2
B. 8/15
C. 2/5
D. 9/20
D. 9/20
S = {1,2,3,4...20?} {3,6,9,12,15,18,20}
P(E) = N(E)/N(S) = 9/20
Find the distance of AC if A is (3, -7) and C is (0, 3)
10.44
The angle of elevation of a plane is 73 degrees, if the plane’s altitude is 2500m in the air how far away is it?
976.82
Adrian biked 5 miles east to the train station from his home. The train took him 10 miles north. How far is Adrian from his home?
11.18
Suppose you have a 6 sided die and a 5 part spinner with the colors blue, red, green, purple, and yellow
Find P (2n ~ red)
A. .30
B. .20
C. .10
D. .13
(1/6) • (4/5) = 2/15 = .13
Find the distance between (-1, 4) & (-3, -4)
8.25
Cleaners are cleaning the windows at casino live, to reach the windows a large ladder is propped up against the building. The ladder makes a 60 degree angle towards the building. How far up the wall does the ladder reach?
5.20m
Suppose you have a 6 sided die and a 5 part spinner with the colors blue, red, green, purple, and yellow. Which of these is true
A. P(Oddnred) = .1
B. P(Oddnred) = .3
C. P(Oddnred) = .45
D. P(Oddnred) = .01
A. P(Oddnred) = .1
How far from the wall is the base of the ladder? 60 degrees hypotenuse 6m
3m