Standard deviation: What is the statistical safety stock?

Question 23: If the standard deviation of demand is six per
week, demand is 50 per week, and the desired service level is 95%,
approximately what is the statistical safety stock?:

a) 8 units

b) 10 units

c) 16 units

d) 64 units

e) cannot be determined without lead time data

Question 30: A fabrication company wants to increase capacity
by adding a new machine. The firm is considering proposals from vendor A and
vendor B. The fixed costs for machine A are $90,000 and for machine B, $75,000.
The variable cost for A is $15.00 per unit and for B, $18.00. The revenue
generated by the units processed on these machines is $21 per unit. If the
estimated output is 5000 units, which machine should be purchased?:

a) machine A

b) machine B

c) either machine A or machine B

d) no purchase because neither machine yields a profit at
that volume

e) purchase both machines since they are both profitable

Please select the right answers and show explanation on how
you have calculated it.

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