A) Random variable
B) Continuous random variable
C) Probability mass function
D) Discrete random variable

A) Continuous random variable
B) Random variable
C) Probability mass function
D) Discrete random variable

A) Probability mass function
B) Random variable
C) Discrete random variable
D) Continuous random variable

A) The number of deaths per year attributed to motorcycle accidents.
B) The speed of a motorcycle.
C) The time needed to finish a test.

A) The average weight of female athletes.
B) The number of patients in a hospital.
C) The amount of paint used in repainting a building.
D) The average amount of electricity consumed.

A) P(1) = 0, P(2) = 0.71, P(3) = 0.39
B) P(1) = 9/14, P(2) = 4/14, P(3) = 1/14
C) P(1) = 0.08, P(2) = 0.12, P(3) = 1.03
D) P(1) = 10/33, P(2) = 1/3, P(3) = 12/33

A) The sum of all the probability distribution is always equal to one.
B) The value of a random variable could be zero.
C) Random variables can only have one value.
D) The probability of a random variable could be zero.

A) 0,2,3
B) 1,1,2
C) 1, 2, 3
D) 2, 3, 4

A) b
B) d
C) a
D) c

A) The number of tourists each day in a museum.
B) The lifetime in hours of 15 flashlights.
C) The number of books in the library.
D) The weight of grade 1 pupils.

A) 2
B) 0
C) 3
D) 1

A) 1.8
B) 1.5
C) 1.2
D) 1.6

A) 0.75
B) 1.25
C) 1.00
D) 0.50

A) 0.71
B) 0.87
C) 1.12
D) 1.00

A) 3.5
B) 2.0
C) 4.0
D) 1.5

A) 7.50
B) 4.15
C) 6.35
D) 8.00

A) 8.00
B) 6.35
C) 4.15
D) 2.83

A) C
B) D

A) C
B) D

A) C
B) D

A) C
B) D

A) 0.2
B) 0.8
C) 0.5
D) 0.3

A) 3.2
B) 6.1
C) 0.61
D) 2.3

A) 6.1
B) 2.3
C) 0.781
D) 0.61

A) 2.3
B) 0.781
C) 0.61
D) 6.1

A) variance
B) mean
C) median
D) standard deviation

A) standard deviation
B) mean
C) median
D) variance

A) standard deviation
B) median
C) variance
D) mean

A) 1/3
B) 1/2
C) 2/3
D) 1/6

A) 3.3
B) 1.42
C) 2.01
D) 12.29

A) 12.29
B) 1.42
C) 2.01
D) 3.3

A) 1
B) 10
C) 0
D) 100

A) bell-shaped
B) uniform
C) skewed left
D) skewed right

A) 95%
B) 68%
C) 50%
D) 99.7%

A) infinity
B) 1
C) 2
D) 0.5

A) 100%
B) 99.7%
C) 95%
D) 68%

A) 100
B) 0
C) 1
D) 10

A) 75%
B) 50%
C) 100%
D) 25%

A) it is skewed
B) it is symmetrical
C) it has a long tail
D) it is assymetrical

A) Mean ≠ Median ≠ Mode
B) Mean = Median = Mode
C) Mean < Median < Mode
D) Mean > Median > Mode

A) 68%
B) 50%
C) 95%
D) 99.7%

A) Mean and standard deviation
B) Interquartile range
C) Variance and range
D) Median and mode

A) Shifts the curve left or right
B) Changes the spread of the curve
C) No effect
D) Changes the shape of the curve

A) No effect
B) Changes the height of the curve
C) Changes the shape of the curve
D) Shifts the curve left or right

A) The curve shifts to the right
B) The curve becomes more peaked
C) The curve becomes more spread out
D) The curve shifts to the left

A) 1/2
B) 3/8
C) 3/5
D) 5/8

A) d
B) a
C) c
D) b