Homework Help: Statistics

Posted by chalulu on Sunday, March 13, 2011 at 5:49pm.

A test consists of 90 mulitiple choice questions, each with five possible answers, only one of which is correct. Find the mean and the standard deviation of the number of correct answers.

Statistics - MathGuru, Wednesday, March 16, 2011 at 8:40pm
mean = np = 90 * 1/5 = ?

(Note: convert any fractions to decimals.)

standard deviation = √npq = √(90 * 1/5 * 4/5) = ?

(Note: q = 1 - p)

I'll let you take it from here.

Answer this Question

Related Questions

Statistics - A multiple choice test consists of 60 questions. Each question has ...
stats - a test consists of 25 multiple choice questions. Each has 5 possible ...
elementary stats - On a multiple choice test with 11 questions, each question ...
statistics - A multiple choice test has 20 questions with each having 4 possible...
Binomial Distribution - A biology quiz consists of twelve multiple-choice ...
statistics - A student is taking a multiple choice test where each question have...
statistics - 10. A student is taking a multiple choice test where each question ...
Stats - An instructor gives a test with 20 multiple choice questions. There are ...
Statistics - A multiple choice test has five choices. Therefore the probability ...
advanced statistics - suppose a student takes a multiple choice test with 10 ...

For Further Reading

First Name:
School Subject:
Answer: