Probability Quiz

Find the P(rolling a number less than 2) on a 6-sided fair die.

• 0.667

• 1

• 0

• 0.167

• 0.333

A bag contains 5 red balls, 6 blue balls, and 9 green balls. If one ball is drawn, what is the probability of drawing a red ball or a green ball? Are the events mutually exclusive?

• 0.7; no

• 1; no

• 0.5; yes

• 0.7; yes

• 0.3; no

A card is drawn from a standard deck of 52 cards. Find the probability of getting a Heart or an Ace. Are the events mutually exclusive?

• 0.308; yes

• 0.327; yes

• 0.327; no

• 0.25; yes

• 0.308; no

A box contains 10 items of which 4 are defective. Three items are chosen at random from the box. What is the probability of selecting 3 defectives if the items are replaced after each selection? Are the events dependent or independent?

• 4.0%; independent

• 3.3%; independent

• 3.3%; dependent

• 6.4%; dependent

• 6.4%; independent

An experiment is performed by rolling a 6-sided fair die. List the sample space.

• 1/6

• 6

• {1, 2, 3, 4, 5, 6}

• 1/6

• 1

Assume the distribution of weights for Burmese pythons in the Amazon jungle is skewed right. The distribution of sample means follows which one of the distributions below.

• normal distribution

• skewed left distribution

• skewed right distribution

• symmetric distribution

• uniform distribution

The average weight for oranges grown in Jacksonville Florida is 140 g with a standard deviation of 10 g. Suppose we take a sample of 100 oranges. Determine the mean and standard deviation for the sampling distribution of the sample weights.

• μₓ̄ = 140, σₓ̄ = √10

• μₓ̄ = 140, σₓ̄ = 100

• μₓ̄ = 140, σₓ̄ = 1

• μₓ̄ = 140, σₓ̄ = 10

• μₓ̄ = 140, σₓ̄ = √100

The average weight of a human skeleton is 10 kg with a standard deviation of 2 kg. Suppose 100 human skeletons are selected, describe the sampling distribution for the sample mean skeleton weight.

• approximately normal with mean = 10 and standard deviation = 20

• approximately normal with mean = 10 and standard deviation = 0.2

• shape unknown with mean = 10 and standard deviation = 2

• shape unknown with mean = 10 and standard deviation = 0.2

• approximately normal with mean = 10 and standard deviation = 2

The owner of a computer repair shop has determined that their daily revenue has a mean of $7200 and a standard deviation of $1200. The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will be between $7000 and $7500?

• 0.7933

• 0.1649

• 0.7339

• 0.2661

• 0.8351

Assume that blood pressure readings are skewed right with a mean of 122 and a standard deviation of 6.4. If 25 people are randomly selected, find the probability that their mean blood pressure will be less than 124.

• not enough information given

• 0.0062

• 0.9409

• 0.6227

• 0.3773