Question: In a two-bin inventory system, the demand for 3-inch lag bolts during the 2-week lead time is normally distributed, with an average of 53 units

In a two-bin inventory system, the demand for 3-inch lag bolts during the 2-week lead time is normally distributed, with an average of 53 units per week. The standard deviation of weekly demand is 5 units.
a. What is the probability of demand exceeding the reorder point when the normal level in the second bin is set at 130 units?
b. What is the probability of demand exceeding the 130 units in the second bin if it takes 3 weeks to receive a replenishment order?

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