Statistics and Probability Quiz

Which is a discrete random variable?

• The average amount of electricity consumed.

• The number of patients in the hospital.

• The amount of paint used in repainting a building.

• The average weight of female athletes.

What are the possible outcomes to get Heads/Tails when flipping a coin?

• 1 outcome

• 2 outcomes

• 4 outcomes

• 6 outcomes

What is the probability that tails turn up to 3 cases if the coin tossed up to 4 times?

• 1/6

• ¼

• 1/3

• ½

Which statement is NOT true?

• The value of the random variable could be zero.

• Random variables can only have one value.

• The probability of the value of a random variable could be zero.

• The sum of all probabilities in a probability distribution is always equal to 1.

You decide to collect a bunch of cans of soda and measure the volume of soda in each can. Let X = the number of mL of soda in each can. What type of variable is X?

• X is a discrete random variable.

• X is a continuous random variable.

• X is a not continuous random variable.

• X is not a random variable.

Which is NOT a property of random variable?

• The sum of a random probability of a random variable is equal to 1.

• A random variable cannot be negative.

• A random variable represents numerical outcomes for different situations or events.

• A random variable can be discrete or continuous.

If the probability that a bomb dropped from a place will strike the target is 60% and if 10 bombs are dropped. What is the mean?

• 0.4

• 0.6

• 4

• 6

Which is a probability distribution?

• The sum of the probabilities of all values of the random variable must be equal to 1.

• The sum of the probabilities of all values of the random variable must be less than 1.

• The sum of the probabilities of all values of the random variable must be equal to zero.

• The sum of the probabilities of all values of the random variable must be more than 1.

What is the probability that two Heads will occur in tossing a fair coin thrice?

• ½

• 18

• 38

• 13

Which is used to describe the amount of spread, dispersion, or variability of the items in a distribution?

• Mean

• Variance

• Standard Deviation

• Variance and Standard Deviation