# Question: The probability model below describes the number of repair calls

The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour.

a) How many calls should the shop expect per hour?

b) What is the standard deviation?

a) How many calls should the shop expect per hour?

b) What is the standard deviation?

## Answer to relevant Questions

A small software company will bid on a major contract. It anticipates a profit of $50,000 if it gets it, but thinks there is only a 30% chance of that happening. a) Whatâ€™s the expected profit? b) Find the standard ...A company has discovered that a recent batch of batteries had manufacturing flaws, and has issued a recall. You have 10 batteries covered by the recall, and 3 are dead. You choose 2 batteries at random from your package of ...A farmer has 100 lb of apples and 50 lb of potatoes for sale. The market price for apples (per pound) each day is a random variable with a mean of 0.5 dollars and a standard deviation of 0.2 dollars. Similarly, for a pound ...A salesman normally makes a sale (closes) on 80% of his presentations. Assuming the presentations are independent, find the probability of each of the following. a) He fails to close for the first time on his fifth ...A website manager has noticed that during the evening hours, about 3 people per minute check out from their shopping cart and make an online purchase. She believes that each purchase is independent of the others and wants to ...Post your question