ELEMENTARY STATISTICS EXAM 3
UPDATED ACTUAL QUESTIONS AND
VERIFIED ANSWERS
●● On a test with a population mean of 75 and standard deviation equal
to 16, if the scores are normally distributed, what percentage of scores
fall below a score of 83.8?
Answer: 70.88
●● A stockbroker has kept a daily record of the value of a particular
stock over the years and finds that prices of the stock form a normal
distribution with a mean of $8.52 with a standard deviation of $2.38.
What is the percentage of the distribution lies between $5 and $11?
Answer: 78.41%
●● A testing service has 1,000 raw scores. It wants to transform the
distribution so that the mean = 10 and the standard deviation = 1. To do
so, ____________.
Answer: -a and d
●● A stockbroker has kept a daily record of the value of a particular
stock over the years and finds that prices of the stock form a normal
distribution with a mean of $8.52 with a standard deviation of $2.38.
,The percentage of scores that lie between $9.00 and $10.00 is
__________
Answer: 15.31%
●● On a test with a population mean of 75 and standard deviation equal
to 16, if the scores are normally distributed, what is the percentile rank
of a score of 56?
Answer: 11.70
●● A distribution has a mean of 60.0 and a standard deviation of 4.3.
The raw score corresponding to a z score of 0.00 is _________.
Answer: 60.0
●● A testing bureau reports that the mean for the population of Graduate
Record Exam (GRE) scores is 500 with a standard deviation of 90. The
scores are normally distributed.
The proportion of scores between 300 and 400 is ______________.
Answer: 0.1203
●● The area beyond a z score of -1.12 is the same as the area beyond a z
score of 1.12.
Answer: True
,●● z scores allow comparison of variables that are measured on different
scales.
Answer: True
●● When a sampled score is put back in the population before selecting
the next score, this process is called sampling without replacement.
Answer: False
●● When two events are mutually exclusive then p(A and B) must equal
1.00.
Answer: False
●● A "hungry" undergraduate student was looking for a way of making
some extra money. The student turned to life of vice - gambling. To be a
good gambler, he needed to know the probability of certain events. Help
him out by answering the following question.
The probability of drawing a face card (king, queen or jack) of any suit
from a deck of 52 ordinary playing cards in one draw is __________
Answer: 0.231
●● Let's assume you are having a party and have stocked your
refrigerator with beverages. You have 12 bottles of Coors beer, 24
, bottles of Schlitz light beer, 12 bottles of Hamms beer, 2 bottles of
Heineken dark beer and 6 bottles of Pepsi soda. You go to the
refrigerator to get beverages for your friends. In answering the following
question assume you are randomly sampling without replacement.
What is the probability the first beverage you get is a beer?
Answer: 0.9250
●● Two events are independent if the occurrence of one has no effect on
the probability of occurrence of the other.
Answer: True
●● If a stranger gives you a coin and you toss it 1,000,000 times and it
lands on heads 600,000 times, what is p(Heads) for that coin?
Answer: 0.6000
●● Probability values range from 0 to 1.
Answer: True
●● The probability of randomly selecting a face card (K, Q, or J) or a
spade in one draw equals ___________.
Answer: .0.4231
UPDATED ACTUAL QUESTIONS AND
VERIFIED ANSWERS
●● On a test with a population mean of 75 and standard deviation equal
to 16, if the scores are normally distributed, what percentage of scores
fall below a score of 83.8?
Answer: 70.88
●● A stockbroker has kept a daily record of the value of a particular
stock over the years and finds that prices of the stock form a normal
distribution with a mean of $8.52 with a standard deviation of $2.38.
What is the percentage of the distribution lies between $5 and $11?
Answer: 78.41%
●● A testing service has 1,000 raw scores. It wants to transform the
distribution so that the mean = 10 and the standard deviation = 1. To do
so, ____________.
Answer: -a and d
●● A stockbroker has kept a daily record of the value of a particular
stock over the years and finds that prices of the stock form a normal
distribution with a mean of $8.52 with a standard deviation of $2.38.
,The percentage of scores that lie between $9.00 and $10.00 is
__________
Answer: 15.31%
●● On a test with a population mean of 75 and standard deviation equal
to 16, if the scores are normally distributed, what is the percentile rank
of a score of 56?
Answer: 11.70
●● A distribution has a mean of 60.0 and a standard deviation of 4.3.
The raw score corresponding to a z score of 0.00 is _________.
Answer: 60.0
●● A testing bureau reports that the mean for the population of Graduate
Record Exam (GRE) scores is 500 with a standard deviation of 90. The
scores are normally distributed.
The proportion of scores between 300 and 400 is ______________.
Answer: 0.1203
●● The area beyond a z score of -1.12 is the same as the area beyond a z
score of 1.12.
Answer: True
,●● z scores allow comparison of variables that are measured on different
scales.
Answer: True
●● When a sampled score is put back in the population before selecting
the next score, this process is called sampling without replacement.
Answer: False
●● When two events are mutually exclusive then p(A and B) must equal
1.00.
Answer: False
●● A "hungry" undergraduate student was looking for a way of making
some extra money. The student turned to life of vice - gambling. To be a
good gambler, he needed to know the probability of certain events. Help
him out by answering the following question.
The probability of drawing a face card (king, queen or jack) of any suit
from a deck of 52 ordinary playing cards in one draw is __________
Answer: 0.231
●● Let's assume you are having a party and have stocked your
refrigerator with beverages. You have 12 bottles of Coors beer, 24
, bottles of Schlitz light beer, 12 bottles of Hamms beer, 2 bottles of
Heineken dark beer and 6 bottles of Pepsi soda. You go to the
refrigerator to get beverages for your friends. In answering the following
question assume you are randomly sampling without replacement.
What is the probability the first beverage you get is a beer?
Answer: 0.9250
●● Two events are independent if the occurrence of one has no effect on
the probability of occurrence of the other.
Answer: True
●● If a stranger gives you a coin and you toss it 1,000,000 times and it
lands on heads 600,000 times, what is p(Heads) for that coin?
Answer: 0.6000
●● Probability values range from 0 to 1.
Answer: True
●● The probability of randomly selecting a face card (K, Q, or J) or a
spade in one draw equals ___________.
Answer: .0.4231
