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Task 4 R=39 ) Task 4                                       &

Task 4
R=39

) Task 4                                                                                                     R is 39
R=39                
A company produces light bulbs whose life follows a normal distribution, with mean (1300+R) hours and standard deviation (50+R) hours. If we choose a light bulb randomly  
a. What is the probability that its lifetime will be less than 1600 hours?               
b. What is the probability that its lifetime will be more than 1850 hours?          
c. What is the probability that its lifetime will be between 1280 and 1740 hours?
d. What is the lifetime in hours that R % of the bulbs exceed?               

Math   Statistics-And-Probability   
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