Question

9.Approximately 80% of students do their homework in time. Each student does homework independently. In a class of 40, what is the probability that 35 students will do their homework on time? Students are selected randomly.

A. 0.0001817 B.0.0167 C.0.0854 D.0.2783 E.0.8 F.0.9171

Answer #1

Given that 80% students do their homework on time.

10.Approximately 80% of students do their homework in time. Each
student does homework independently. In a class of 40, what is the
probability that at least 39 students will do their homework on
time? Students are selected randomly.
A. 0.001462 B. 0.004276 C. 0.007285 D.0.009353 E.0.032293
F.0.059264

Three students work independently on a homework problem: The
probability that the first student solves the problem is 0.95. The
probability that the second student solves the problem is 0.85. The
probability that the third student solves the problem is 0.8.
What is the probability that at least one student solves the
problem?

Three students work independently on a homework problem: The
probability that the first student solves the problem is 0.95. The
probability that the second student solves the problem is 0.85. The
probability that the third student solves the problem is 0.8.
A) What is the probability that either the first or the second
student solves the problem?
B) What is the probability that at least one student solves the
problem?
(Answer as a decimal rounded to three decimal places)

1
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Let X = the number of heads in 15 flips of the fair coin. X
takes on the values 0, 1, 2, 3, ..., 15. Since the coin is fair, p
= 0.5 and q = 0.5. The number of trials is n = 15. State the
probability question mathematically.
2
Approximately 70% of statistics students do their...

37. In a class of 20 students each student tosses a fair coin
4 times independently.
(a) What is the probability that no student gets 4
heads?
(b) What is the expected number of students who get 4
heads?

In a group of 100 students, 40 were randomly put in the Tuesday
algebra class. Independently of that event, 30 students were
randomly put in a Wednesday English class. If a student chosen at
random is in the algebra class, what is the probability that he or
she is also in the English class?

In a certain state, 30% of students will take an AP class, 40%
of students will play a school sport, and 15% of students will do
both. If we randomly selected a student, find the following:
(a) the probability the student will play a sport, but not take
an AP class.
(b) the probability the student will play a sport, given the
student takes an AP class.
(c) the probability the student plays a sport or takes an AP
class....

80 students from a university were interviewed at the Student
Center and asked if they were in favor of separating a smoking
area. The survey are:
There are 50 freshmen, 30 are not freshmen.
There are 38 students in favor, 32 against and 10 who did not
comment.
Of those in favor, 15 are first-year and 23 are not
first-year.
Of those who are against, 27 are first-year and 5 are not
first-year.
Of those who did not comment, 8...

The time, in minutes spent texting in class, is approximately
normally distributed with a mean of 6.2 minutes and a standard of
1.6 minutes.
The distance, in city blocks, that a student must travel to get
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degrees of freedom. (The standard city block is approximately 400
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1) What is the probability that the average time spent texting
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In Stats class, 57% of students eat breakfast in the morning and
80% of students floss their teeth. Forty-six percent of students
eat breakfast and floss their teeth.
What is the probability that a student from this class eats
breakfast OR flosses their teeth?
a.
11%
b.
34%
c.
9%
d.
91%
e.
57%

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