Post a New Question

algebra/math

posted by .

The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 169 and a variance of 9. The material is considered defective if the breaking strength is less than 163 pounds. What is the probability that a single, randomly selected piece of material will be defective? (Give the answer to two decimal places.)

  • algebra/math -

    I am not certain if you use the standard notation that variance = (standard deviation)^2
    if so , then SD = 3

    I make use of this webpage for routine standard deviation problems
    http://davidmlane.com/hyperstat/z_table.html

    enter the mean of 169 and sd of 3, then click the "below" button and enter 163

    I got a probability of.002275

    If you meant your sd to be 9, make the necessary changes in your input

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

More Related Questions

Post a New Question