a random sample of 12-ounces milkshakes from 11 fast food restaurants had the following number of calories.

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476 580 504 473 375 700 510

591 472 399 450

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assume the population standard deviation is o=86

if appropriate, construct a90 % confidence interval for the mean calorie count for all12 -ounce milkshakes sold at fast-food restaurants. Round the answers to at least two decimal places. A 90% confidence interval for the mean calorie count for all12 -ounce milkshakes sold at fast-food restaurants is ( ? < < ? )