A calculus instructor uses computer aided instruction and, Ask an Expert

Statistics

Find the expected value of the number of tests taken.

A calculus instructor uses computer aided instruction and allows students to take the midterm exam as many times as essential until a passing grade is obtained. Following is a record of the number of students in a class of 20 who took the test each number of times.

Students	Number of tests
10	1
7	2
2	3
1	4

Find out the expected value of the number of tests taken.

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M920785

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

Determine the sample size n needed to construct a 99

Determine the sample size n needed to construct a 99?% confidence interval to estimate the population mean when σ=24 and the margin of error equals 9.

Doctoral assistant ships of phd students 50 have paid

Doctoral assistant ships of Ph.D students 50% have paid assistant ships. a random sample of n=200 students is chosen.. based on this sample and using the properties of the binomial distribution, what is the approximate s ...

The jo supplies company buys calculators from a korean

The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 20%. If 15 calculators are selected at random, what is the probability that less than 5 of the calculators w ...

In a class there are 7 girls and 5 boys the median age of

In a class there are 7 girls and 5 boys. The median age of the 7 girls is 12 and the median age of the 5 boys is 14. Additionally, you know that there are 3 girls with age greater than 14 and 2 boys with age less than 12 ...

A population has a mean of 400 and a standard deviation of

A population has a mean of 400 and a standard deviation of 50. Suppose a sample of size 125 is selected and is used to estimate . Use z-table. 1) What is the probability that the sample mean will be within +/- 6 of the p ...

How much of the opposing side should you share in a

How much of the opposing side should you share in a presentation to a multiple-perspective audience, and what techniques would you use?

In a survey ofnbsp3153nbspadultsnbsp1407nbspsay they have

In a survey of 3153 adults, 1407 say they have started paying bills online in the last year. Construct a? 99% confidence interval for the population proportion. Interpret the results. A? 99% confidence interval for the p ...

1 choose all probability distributions which are

1. Choose all probability distributions which are theoretically related to normal probability distribution 2. The 68-95-99.7 rule states that in a normal distribution 3. For a normal distribution the a mean of 179 and st ...

A survey of a group of college students was done to find

A survey of a group of college students was done to find out how students get to school for the school year. 15% of those surveyed were from out of state. Of those that were in-state, 56% used a car as their primary form ...

Assuming that the bank wants assets with high yields and

Assuming that the bank wants Assets with High Yields and Liabilities with Low Costs then what decisions would the bank make for the Interest Rates on both Loans (Fixed Rate Corporate, Floating Rate Corporate, Installment ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert