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Your Results for: "Multiple Choice"
Student Name: KELVIN X. CRESPO SOTO
Student Email: [email protected]
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Summary of Results
67% Correct of 15 Scored items:
10 Correct:
Site Title: Basic Business Statistics, 11e
Book Title: Basic Business Statistics, 11e
5 Incorrect:
67%
33%
More information about scoring
Book Author: Berenson
Location on Chapter 6 > Self-Study Quizzes >
Site: Multiple Choice
Date/Time July 3, 2015 at 3:24 AM (UTC/GMT)
Submitted:
1.
Which of the following characteristics do normal and uniform distributions have in common?
Your Answer: The distributions are symmetric and the mean is equal to the median.
Correct
2.
The figure below represents which of the following distributions?
Your Answer: Normal
Correct
3.
If x is uniformly distributed from 5 to 12, (5 ≤ x ≤ 12), determine the standard deviation of this
distribution.
Your Answer: (blank)
4.
The area to the right of the mean in a normal distribution is indicated by which of the following?
Your Answer: 0.5
Correct
5.
A standard normal distribution has which of the following properties?
Your Answer: The mean is equal to 0 and the variance is equal to 1.
Correct
6.
Let z be a normal random variable with a mean of 0 and a standard deviation of 1. Determine P(z
≤ 1.4).
Your Answer: 0.0808
Correct Answer: 0.9192
This is P(z ≤ -1.4).
7.
Let x be a normal random variable with a mean of 50 and a standard deviation of 3. A z score was
calculated for x, and the z score is -1.2. What is the value of x?
Your Answer: 46.4
Correct
8.
Let x be a normal random variable with a mean of 35 and a standard deviation of 4. Determine
P(30 ≤ x ≤ 37).
Your Answer: 0.5859
Correct
9.
What percentage of a normal distribution is found within a range of z scores from -2 to +2?
Your Answer: 90%
Correct Answer: 95%
0.9772 – 0.0228 indicates approximately 95% of the normal distribution falls between z = -2 and
z = +2.
10
.
Suppose you are working with a data set that is normally distributed with a mean of 70 and a
standard deviation of 10. Determine the value of x such that 65% of the values are greater than x.
Your Answer: 66
Correct
11
.
In which of the following continuous distributions are extreme values most likely (within its
range)?
Your Answer: Uniform
Correct
12
.
On the day before an exam in an online class, students email questions to the professor at a rate
of 1 every 20 minutes, exponentially distributed. Determine the probability that more than 1 hour
elapses between email messages.
Your Answer: 5%
Correct
13
.
For an exponential distribution with the parameter lambda equal to 10 per minute, what is the
mean of the exponential distribution?
Your Answer: 0
Correct Answer: 0.1
The mean of a standard normal distribution is 0.
14
.
Let x be a binomial random variable with n = 30 and p = 0.7. Using the normal distribution to
approximate the binomial, to determine the probability of more than 16 but less than 25
successes, which of the following is the correct representation?
Your Answer: P(16 < x < 25)
Correct Answer: P(16.5 < x < 24.5)
The correction for continuity adjustment is 0.5 units outside of the binomial range. In this case,
we can consider successes between 17 and 24, inclusive, which leads to a normal approximation
that uses 16.5 and 24.5.
15
.
Let x be a binomial random variable with n = 25 and p = 0.6. Using the normal distribution to
approximate the binomial, determine the probability that more than 12 successes will occur.
Your Answer: 0.8461
Correct
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