Quiz Two (Chapters 4-6)

In its standardized form, the normal distribution

has a mean of 0 and a standard deviation of 1

The probability of the cumulative standardized normal distribution at Z is 0.6255. The value of Z is

0.32

The following table contains the probability distribution for X = the number of retransmissions necessary to successfully transmit a 1024K data package through a network. Calculate the mean or expected value for the number of retransmissions

1

The probability of the cumulative standardized normal distribution at Z is 0.8770. The value of Z is

1.16

A business venture can result in the following outcomes (with their corresponding chance of occurring in parentheses): Highly Successful (10%), Successful (25%), Break Even (25%), Disappointing (20%), and Highly Disappointing (?). If these are the only outcomes possible for the business venture, what is the chance that the business venture will be considered Highly Disappointing?

20%

An alcohol awareness task force at a Big-Ten university sampled 200 students after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm. The following result was obtained.

30/200 or 15%

If the outcome of event A is not affected by event B, then events A and B are said to be..

Independent

Another name for the mean of a probability distribution is its expected value

True

The collection of all possible events is called

a sample space

A probability distribution

associates a probability of occurrence with each outcome