Multiple choice problems based on the probability distribution.
1) The assembly time for a product is uniformly distributed between 6 to 10 minutes.
The standard deviation of assembly time (in minutes) is approximately
a) 1.3333
b) 1.1547
c) 0.1111
d) 0.5773
2) Given that Z is a standard normal random variable, what is the possibility that -2.51 £ Z £ -1.53?
a) 0.4950
b) 0.4370
c) 0.0570
d) 0.9310