WorksheetsNAT REVIEW 2023
Total questions: 15
Worksheet time: 13mins
It is a variable being measured to produce numerical observations associated with the random outcomes of a chance experiment.
fixed variable
dependent variable
independent variable
random variable
In a random experiment, what are possible outcome if a coin is tossed once?
Tail (T) and Head (H)
The number of dots 1,2,3,4,5,6
Tail and Tail (TT), and Head and Head (HH)
The pair of even number of dots (2,2),(2,4),(2,6),(4,2),(4,4),(4,6),(6,2),(6,4) and (6,6)
A fair coin is tossed three times and the sequence of
heads (H) and tails (T) is observed.
What is the probability that no heads will appear?
1/8
2/3
3/8
5/8
Which of the following is a discrete random variable?
The number of patients in a hospital.
The average weight of female athletes.
The average amount of electricity consumed.
The amount of paint used in repainting a building.
It is a list, a table, a graph, or a formula of probabilities associated with each of its possible values.
Bar Chart
Normal Distribution
Probability Distribution Function
Frequency Distribution Table
Does the following table represent a probability distribution?
Yes, because each value of F(X) is between 0 and 1, and the sum of all values of F(X) is 1.
No, because each value of F(X) is between 0 and 1.
No, because the sum of all values of F(X) is 1.
Yes, because all values of F(X) are the same.
Which probability value would satisfy the given probability distribution?
0.16
0.17
0.18
0.19
What is the mean of the probability distribution?
0.43`
1.66
1.26
1.64
What is the variance of the probability distribution?
1.66
1.08
1.01
2.20
Which of the following is NOT a property of a normal curve?
The total area under it is 1.
The curve is symmetric about the center.
It is divided into positive 2 and negative 2 standard deviations
The mean, median, and mode have the same value and are located at the same point.
What do you call a normal distribution with a mean of 0 and a
standard deviation of 1?
Frequency Distribution
Probability Distribution
Standard Normal Distribution
Cumulative Distribution
The area under the part of normal curve in the standard normal distribution that lies within 2 standard deviations of the mean is
68%
95%
99.7%
100%
A set of Mathematics exam scores has a mean of 68 and a standard deviation of 8. A set of English exam scores has a mean of 75 and a standard deviation of 10. For which exam would a score of 78 have a higher standing?
Math
English
Both Math & English
Cannot be determined
The average time for a courier to travel from Manila to Pampanga is 200 minutes, and the standard deviation is 10 minutes. What standard score corresponds to a trip that takes 180 minutes?
−1.98
1.98
2
−2
What is the area of the region in the normal curve between one standard deviation below the mean and three standard deviations above the mean?
34 %
81.85 %
84 %
99.72 %
