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Random Variables - Probability and Statistics Flashcards | StudBud
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Random Variables - Probability and Statistics
Random Variables - Probability and Statistics
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1
What is P(X < 44.1) ?
.5
.05
.15
.38
2
Do you use a density curve or histogram when X = time it takes to run a mile?
HIstogram
Random
Continuous
Density Curve
3
Draw a density curve with a length of 4. What is the height?
1/2
1/4
1
4
4
What is P( X < 1.5) ?
About .75
About .30
About .50
About .05
5
Find the expected value for number of orders per week
44.61 orders
43.21 orders
35.9 orders
40 orders
6
Use the previous density curve. What is P (X < 4) ?
.25
.25
.4
1
7
What kind of data is represented in the graph?
Probability
Discrete
Continuous
None
8
What is P (X < 30) ?
.45
.15
.37
.102
9
What is P (20 < X < 55)?
.65
.98
.76
.82
10
Use the previous density curve. What is P(X > 2.76) ?
.5
.375
1
.31
11
Do you use a density curve or histogram when X = number of math majors per year at CSU?
Density Curve
Discrete
Continuous
Histogram
12
Discrete or Continuous:
The speed of a race car in mph
Neither
Discript
Discrete
Continuous
13
Which probability notation represents "at least 2"
P(X ≥ 2)
P(X≤ 2)
P(X< 2)
P(X= 2)
14
What kind of data is represented in the graph?
None
Probability
Discrete
Continuous
15
Find the Standard Deviation
1.98
.87
2.7
1.73
16
Discrete or Continuous: The amount of winnings from the TN lottery on a given day
Discrete
Continuous
Random
Probability
17
What's the probability that a person has more than 3 credit cards?
.11
.18
.08
.03
18
Discrete or Continuous: The number of cups of coffee that Ms. Geoffroy drinks each day
Random
Continous
Probability
Discrete
19
Find the variance:
3.98
.98
1.99
2.99
20
Use the previous density curve. What is P( 1.5 < X < 3) ?
.241
.375
.5
.456
