Post a New Question


posted by .

The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses more than 350 minutes?

  • statistics -

    Use z-scores.


    z = (x - mean)/sd

    mean = 500
    sd = 50
    x = 350

    Substitute the values into the formula and find z. Use a z-table to determine your probability.

Answer This Question

First Name:
School Subject:

Related Questions

More Related Questions

Post a New Question