Post a New Question


posted by .

The scores on a national achievement test are normally distributed with a mean of 50 and a standard deviation of 10. Out of a group of 200 students, how many would you expect to score more than 70?

  • statistics -

    μ=50, σ=10;
    For score 70, convert to standardized value
    Look up standard normal distribution table to get
    P(z<=2)=0.9772, so
    or the average number of students with score of 70 or more
    = P(x>70)*200=4.56 = 5 approx.

Answer This Question

First Name
School Subject
Your Answer

Related Questions

More Related Questions

Post a New Question