Asked by carissa
A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last:(give 4 decimal places for each answer)
a. Less than 250 hours
b. Between 225 and 375 hours
c. More than 400 hours
I know the formula. X-mean/SD. I need help checking my answers!
a. Less than 250 hours
b. Between 225 and 375 hours
c. More than 400 hours
I know the formula. X-mean/SD. I need help checking my answers!
Answers
Answered by
Steve
this site should help:
http://davidmlane.com/hyperstat/z_table.html
http://davidmlane.com/hyperstat/z_table.html
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