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(normal dist) wooden Horse toys last 3.5 (on average) years to break, and have a Std....

(normal dist) wooden Horse toys last 3.5 (on average) years to break, and have a Std. Dev. of 0.6 yrs.

1) if we take 5 horses what is P(SD <= 0.8) ?

probability 5 horses will last less or equal than 3.08 yrs ?

2) probability that the sample average of the lifetimes 5 of the horses is less or equal than 3.08 yrs?

Math   Statistics-And-Probability   
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