1)   A certain company decided to subject its employees to an IQ test.      
"The mean of the IQ test was 115, with a standard deviation of 16. "
Assume that IQ test values follow a normal distribution.

Determine the probability that the value of the IQ test for a randomly selected employee will be:

"a)      less than or equal to 120,"



"b)      greater than 105,"



"c)     in the range of 100 to 130,"



d) exactly 118.




2)   The lifespan of a certain product follows an exponential distribution with a mean lifespan of 200 hours. 
Determine the probability that a given product: 

"a)      will be functional for a maximum of 150 hours, "



"b)      will be functional for at least 250 hours,"


 c) will be functional for exactly 180 hours.