Asked by chalulu
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.
Answers
Answered by
MathGuru
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.
(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.