10. The average amount of a bill during the dinner service at KT's Caf is $54.73...

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10. The average amount of a bill during the dinner service at KT's Caf is $54.73 with a standard deviation of $8.21. (a) At least what percent of the bills are valued between $40.31 and $69.15? (b) What is the smallest interval to guarantee at least 73% of all bill amounts? (c) For random group of 32 bills, what is the probability the average amount is more than $58.25? 4 10. The average amount of a bill during the dinner service at KT's Caf is $54.73 with a standard deviation of $8.21. (a) At least what percent of the bills are valued between $40.31 and $69.15? (b) What is the smallest interval to guarantee at least 73% of all bill amounts? (c) For random group of 32 bills, what is the probability the average amount is more than $58.25? 4