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7.23 the weights of a large shipment of cast iron bollards (used for securinf ropes on dock, etc.) are random variables with µ = 50.25 pounds and σ = 0.63 pounds. what is the probability that bollard selected from this shipment will weigh
(a) less than 49.00 pounds;
(b) more than 50.5 pounds;
(c) between 50 and 51 pounds?

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7.23 The weights of a large shipment of cast iron bollards (used for securing ropes on docks, etc.) are random variables with
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