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# Homework 31) Classify each of the following random variables as discrete or continuous:a) the number of girls born to a couple who will have three children.b) the number of defects found on an...

Homework 3

1) Classify each of the following random variables as discrete or continuous:
a) the number of girls born to a couple who will have three children.
b) the number of defects found on an automobile at final inspection.
c) the weight (in ounces) of the sandwich meat placed on a submarine sandwich.
d) the number of incorrect lab procedures conducted at a hospital during a particular week.
e) the number of customers served during a given day at a drive-through window.
f) the time needed by a clerk to complete a task.
g) the temperature of a pizza oven at a particular time.

2) Consider the following investment outcomes and corresponding probabilities:
Bad outcome: -40,000 with probability 25%
Ok outcome: 10,000 with probability 70%
Great outcome: 70,000 with probability 5%
What is the expected monetary outcome and standard deviation of monetary outcome for this
investment?

3) We are selling five thousand raffle tickets for \$10 each to fundraise for AU. We will give
away one car worth \$20,000, two home theatre systems worth \$3,000 each, five phones
worth \$400 each, and 50 gift certificates for \$20 each. If someone buys one ticket, what is
their expected winnings. Don’t forget to subtract the cost of the ticket.

4) Suppose that x is a binomial random variable with n = 5 and p = .3.
a) Calculate p(x) for each value of x.
b) Find P(x = 3).
c) Find P(x <=>
d) Find P(x <>
e) Find P(x >= 4).
f) Find P(x > 2).

5) Thirty percent of all students entering a coffee shop also buy a pastry. Suppose six students
enter the coffee shop and the students make independent purchase decisions. Calculate the
following probabilities:
a) That exactly five students buy a pastry.
b) That at least three students buy a pastry.
c) That two or fewer students buy a pastry.
d) That at least one student buys a pastry.

6) A professor claims that 90 percent of all email queries are responded to within 24 hours
(excluding weekends). In order to test this claim, a random sample of 15 students who have
recently emailed the professor were selected. Find the following probabilities:
a) P(x <=>
b) P(x > 10).
c) P(x >= 14).
d) P(9 <= x'=""><>

e) P(x <=>
Answered 2 days After Apr 17, 2023

## Solution

Ashish answered on Apr 17 2023
Sheet1
1a    Discrete
1b    Discrete
1c    Continuous
1d    Discrete
1e    Discrete
1f    Continuous
1g    Continuous
2        x    p(x)    x*p(x)
-40000    0.25    -10000
10000    0.7    7000
70000    0.05    3500
500
So, 500 is the expected monetory...
SOLUTION.PDF