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It is known that the start-up time of the fan after a person starts using his...

It is known that the start-up time of the fan after a person starts using his laptop has a normal distribution with an average of 5 minutes and 4 variances. Accordingly, after this
person started using his computer,

a) Find the possibility that the fan does not start for the first 4 minutes.

b) With a 5% probability, the fan will be activated after the minute.

Math   Statistics-And-Probability   
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