A car is designed to last an average of 12 years with a standard deviation of 0.8 years. What is the probability that a car will last less than 10 years?

1. 👍 0
2. 👎 0
3. 👁 573
1. 12-10 = 2
2 years = 2.25 std below the mean.
So, check your Z table for P(Z<-2.25)

1. 👍 0
2. 👎 1
posted by Steve
2. 22%

1. 👍 0
2. 👎 1
posted by Brasha

## Similar Questions

1. ### atlantic

A car is designed to last an average of 12 years with a standard deviation of 0.8 years. What is the probability that a car will last less than 10 years?

asked by claire on April 6, 2017
2. ### statistics

AAA reports that the average age of a car on U.S. roads in recent years has risen to 7.5 years. Suppose that the distribution of the age of automobiles assumes a mound shaped distribution. If 99.7% of the ages are between 1 year

asked by Anonymous on September 14, 2014
3. ### Math

Roughly speaking, the standard deviation indicates how far, on average, the observations are from the mean. Do you think that for the data set below the standard deviation will give a good indication of the typical deviation from

asked by Lyndse on February 21, 2010
4. ### Statistics

1) A Motor Company has purchased steel parts from a supplier for several years and has found that 10% of the parts must be returned because they are defective. An order of 25 parts is received. What are the mean and standard

asked by BEARHUG on February 15, 2009

The average life expectancy of Canadian women is 75 years, and is normally distributed. The standard deviation is known to be 7 years. If a random sample od 49 women is taken, what is the probability that the average age of the

asked by Anonymous on July 19, 2015
6. ### Statistics

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins \$600 and all others win nothing - that gamblers never reach "the

asked by Ray on February 25, 2014
7. ### Statistics

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins \$600 and all others win nothing - that gamblers never reach "the

asked by Ray on February 25, 2014
8. ### Statistics

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins \$600 and all others win nothing - that gamblers never reach "the