Probability questions about students in various classes

4. Of the 47 people who answered "yes" to a question, 8 were male. Of the 100 people who answered"no" to the question, 12 were male. If one person is selected at random from the group, what is the probability that the person answered "yes" or was male?
A) 0.456
B) 0.401
C) 0.136
D) 0.17

5. A teacher designs a test so a student who studies will pass 95% of the time, but a student who does not study will pass 8% of the time. A certain student studies for 85% of the tests taken. On a given test, what is the probability that student passes?
A) 0.12
B) 0.82
C) 0.515
D) 0.808

6. The following table shows the grades of college students in an advanced mathematics course,broken down by year.
Use the table below to find the probability that a randomly selected sophomore gets a B.

A B C D E Totals (%)
Freshmen 3 5 6 4 1 19
Sophomores 6 3 8 2 3 22
Juniors 5 7 15 6 2 35
Seniors 5 4 1 2 5 17
Grad Students 3 2 2 0 0 7

Totals (%) 22 21 32 14 11 100

A) 1/11
B) 3/22
C) 1/7
D) 4/21

Solution Summary

The solution answers three probability questions about students in classes taking tests and answering questions.

... feel comfortable for conceptual understanding of the problems. Solution contains calculations of Probabilities. ...Probability that a student drives, P(D) = 0.6 ...

... the detailed answers to probability, normal distribution, z score and confidence interval problems. ... urban university has 120 students, including 34 ...

The following information is for Questions 2. It is an open ... Notice that the sum of these probabilities is 1 ... Therefore, the probability that you win one or more ...

... P(M or E but M' E 0.3 Question 5 Handout ... e. If the probabilities for D1 and D2 are 0.25 and 0.75, respectively, compute the revised probability in part d ...

... occur is found by multiplying the probabilities of each ... seven students forms to study the environmental questions. ... b. determines the probability that a chosen ...

... Statistics show students who do not study for the ... The test is 20 questions and the student did ... The probability density function of binomial variable is given ...

... DEMAND PROBABILITY 0 0.2 1 0.2 2 0.3 3 0.2 4 0.1 BASED ON THIS TABLE - ANSWER QUESTIONS 13 AND 14 ... Section A only has 5 students and they have all received a ...

... will get more than 2 questions correct ... to use Poisson distribution to calculate probabilities concerning the ... be received c. What is the probability that during ...

Probability questions - Please help and show work. Thank you.1. In a small class of 10 students, 3 did not do their ...2. Suppose a card is drawn at random ...