In November 2020
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Table 2.1
28 17 30 25 22
33 38 23 26 10
14 15 24 22 34
12 33 32 31 26
26 32 35 17 12
34 32 22 19 14
15 27 15 25 31
36 28 35 28 22
26 10 29 19 15
9 20 34 27 20
a) Develop a frequency distribution using classes of 9–14, 15–20, 21–26, 27–32, and 33–38. [1]
b) Develop a relative frequency distribution and a percent frequency distribution. [2]
c) Cumulative frequency and a cumulative relative frequency. [2]
Table 4.1
Software Developers 56 54 54 49 61 48 58 60 59 53 50 58 55 57 52
Web
Developers 47 50 46 47 48 49 46 55 44 42 ----
a) What is the third quartile of spending working hours for Software developers?
b) Create a box plot for the number of hours worked for Software developers.
c) Create a box plot for the number of hours worked for Web developers.
d) Comment on the differences between the box plots for Software & Web developers
Table 2.1
28 17 30 25 22
33 38 23 26 10
14 15 24 22 34
12 33 32 31 26
26 32 35 17 12
34 32 22 19 14
15 27 15 25 31
36 28 35 28 22
26 10 29 19 15
9 20 34 27 20
a) Develop a frequency distribution using classes of 9–14, 15–20, 21–26, 27–32, and 33–38.
b) Develop a relative frequency distribution and a percent frequency distribution.
c) Cumulative frequency and a cumulative relative frequency.
a. Evaluate the probability that on any Particular day there will be fewer than 3 accidents on this superhighway during the peak rush timings.
b. Compute the probability that on any Particular day there will be more than 6 accidents on this Super highway during the peak rush timings.
c. Find the Expected number of accidents per day and variance.
Economists frequently make use of quintiles (i.e., the 20th, 40th, 60th, and 80th percentiles) particularly
when discussing incomes. Suppose that in a large city household incomes are normally distributed
with a mean of $50,000 and a standard deviation of $10,000. An economist wishes to identify the
quintiles. Unfortunately, he did not pass his statistics course. Help him by providing the quintiles.
How much money does a typical family of four spend at a McDonald’s restaurant per visit? The amount is a normally distributed random variable with a mean of $16.40 and a standard deviation of $2.75.
a. Find the probability that a family of four spends less than $10.
b. What is the amount below which only 10% of families of four spend at McDonald’s?
Sugar is packed in 5-pound bags. An inspector suspects the bags may not contain 5 pounds. A sample of 50 bags produces a mean of 4.6 pounds and a standard deviation of 0.7 pound. Is there enough evidence to conclude that the bags do not contain 5 pounds as stated, at α = 0.05? Also, find the 95% confidence interval of the true mean.
a. Evaluate the probability that on any Particular day there will be fewer than 3 accidents on this superhighway during the peak rush timings.
b. Compute the probability that on any Particular day there will be more than 6 accidents on this Super highway during the peak rush timings.
c. Find the Expected number of accidents per day and variance.
a. less than 1000 servings
b. more than 1400 servings
c. between 1100 to 1300 serving
d. less than 1000 but not less than 1350
what is it and write the sample space
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#260206 on Jun 2020