unit 2 busi stats test

it is known that 10% of the calculators shipped from a particular factory are defective. what is the probability that exactly three of five chosen calculators are defective?

0.0081

The foreclosure crisis has been particularly devastating in housing markets in much of the south and west United States, but even when analysis is restricted to relatively strong housing markets the numbers are staggering. For example, in 2011 an average of three residential properties were auctioned off each weekday in the city of Boston, up from an average of one per week in 2005. What is the probability that exactly four foreclosure auctions occurred on a randomly selected weekday of 2011 in Boston?

0.1680

the waiting time at an elevator is uniformly distributed between 30 and 200 seconds. what is the probability a rider must wait between 1 minute and 1.5 minutes?

0.1765

It is known that 10% of the calculators shipped from a particular factory are defective. What is the probability that at least one in a random sample of four calculators is defective?

0.3439

Find the probability P(-1.96 ≤Z≤ 0)

0.4750

the probability that a normal random variable is less than its mean is___

0.5

the waiting time at an elevator is uniformly distributed between 30 and 200 seconds. what is the probability a rider waits less than two minutes?

0.5294

the waiting time at an elevator is uniformly distributed between 30 and 200 seconds. what is the probability a rider must wait more than 1.5 minutes?

0.6471

It is known that 10% of the calculators shipped from a particular factory are defective. What is the probability that none in a random sample of four calculators is defective?

0.6561

find the z value such that P(Z≤z) = 0.9082.

1.33

how many ways can a potential four letter word, whether or not is has a meaning, be created out of 10 available letters?

10*9*8*7/(4*3*2*1)

the waiting time at an elevator is uniformly distributed between 30 and 200 seconds. find the mean and standard deviation of the waiting time.

115 seconds and 49.07 seconds

5! is equal to

5*4*3*2*1

the expected value of a random variable X can be referred to or denoted as___

E(X)

if A and B are independent events, which of the following is correct?

P(A\B)= P(A)

Let A and B be two independent events with P(A)= 0.40 and P(B)= 0.20. which of the following is correct?

P(AuB)= 0.52

assume the sample space S={win, loss}. select the choice that fulfills the requirements of the definition of probability

P{win}= 0.7, p{loss}= 0.3

which of the following represents a subjective probability?

a skier believes she has a 10% chance of winning a gold medal

what is probability?

a value between 0 and 1 assigned to an event that measures the likelihood of its occurrence

the complement of an event A, within the sample space S, is the event consisting of__

all outcomes in S that arent in A

a sample space contains___

all possible outcomes of an experiment

what is a simple event?

an event that contains only one outcome of a sample space

mutually exclusive and collectively exhaustive events___

contain all outcomes in a sample space and dont share common outcomes

the union of events A and B, denoted by AuB___

contains all outcomes that are in A or B

the intersection of events A and B, denoted by AnB___

contains outcomes that are both in A and B

which of the following statements is the most accurate about a binomial random variable?

it counts the number of successes in a given number of trials

which of the following statements is the most accurate about a Poisson random variable?

it counts the number of successes in a specified time or space interval

which of the following does not represent a continuous random variable?

the number of customer arrivals to a bank between 10 am and 11 am

when some objects are randomly selected, which of the following is true?

the order in which objects are selected does not matter in combinations

which of the following can be represented by a continuous random variable?

the time of a flight between chicago and new york

events are collectively exhaustive if___

they contain all outcomes of an experiment

which of the following are mutually exclusive events of an experiment in which two coins are tossed?

{TT, HH} and {TH}