A manufacturer knows that their items have a normally distributed lifespan, with a mean of 15 years, and standard deviation of 3.7 years. If you randomly purchase 22 items, what is the probability that their mean life will be longer than 13 years?

The probability that their mean life will be longer than 13 years = .9943 or 99.43%

Step-by-step explanation:

Given -

Mean = 15 years

Standard deviation = 3.7 years

Sample size ( n ) =22

Let be the mean life of manufacturing items

the probability that their mean life will be longer than 13 years =

=        

                    =  

                    =       Using Z table

                    = 1 - .0057

                    =  .9943

answer: okw

step-by-step explanation:

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: