7. The weight of a certain breed of dog is normally distributed (bell-shaped) with mean 76 pounds and standard deviation 4 pounds. Show calculations to support your answer. If it is not possible to determine the answer, explain why. a. What percent of dogs of this breed are between 72 and 80 pounds? b. What percent of dogs of this breed are between 68 and $4 pounds? c. What percent of dogs of this breed weigh less than 68 pounds? d. What percent of dogs of this breed weigh less than 84 pounds? e. Would it be unusual for a dog of this breed to be 90 pounds? Explain