Question 1 of 25
1.0 Points
Which of the following correctly describes the relationship between a sample and a population? Reset Selection

 Part 2 of 9 -

Question 2 of 25
1.0 Points
The probability of an event and the probability of its complement always sum to: Reset Selection

Question 3 of 25
1.0 Points
Three cards are drawn from a deck without replacement. What is the probability that all three cards are clubs? Reset Selection

 Part 3 of 9 -

Question 4 of 25
1.0 Points
The following data were obtained from a survey of college students. The variable  X represents the number of non-assigned books read during the past six months.
 x 0 1 2 3 4 5 P ( X= x) 0.2 0.25 0.2 0.15 0.1 0.1

Find P( X > 1) Reset Selection

Question 5 of 25
1.0 Points
Find the variance of the following probability distribution.

 X P(X) 1 0.10 2 0.35 3 0.10 4 0.15 5 0.30

Reset Selection

Question 6 of 25
1.0 Points
In a small town, 60% of the households have dogs. If 5 households are randomly selected, what is the probability that at least 4 of them have dogs? Reset Selection

 Part 4 of 9 -

Question 7 of 25
1.0 Points
The standard deviation of a probability distribution must be: Reset Selection

Question 8 of 25
1.0 Points
In a normal distribution, changing the standard deviation: Reset Selection

Question 9 of 25
1.0 Points
If Z is a standard normal random variable, then the value z for which P(-z < Z < z) equals 0.8764 is Reset Selection

Question 10 of 25
1.0 Points
The average height of flowering cherry trees in a nursery is 11 feet. If the heights are normally distributed with a standard deviation of 1.6, find the probability that a randomly selected cherry tree in this nursery is less than 13 feet tall. Reset Selection

Question 11 of 25
1.0 Points
The standard deviation of a probability distribution is a: Reset Selection

Question 12 of 25
1.0 Points
The normal distribution is: Reset Selection

 Part 5 of 9 -

Question 13 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).  NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

The histogram below represents scores achieved by 250 job applicants on a personality profile.

How many job applicants scored between 10 and 30? Place your answer in the blank. Do not use any stray symbols.  For example, 123 would be a legitimate answer.
Reset Selection

Question 25 of 25
1.0 Points
Using the standard normal curve, the Z- score representing the 99th percentile is 2.326.

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