مساله احصاء لوسمحتو

[ساعتي خربانه]

The average repair cost of a microwave oven is $55, with a standarddeviation of $8. The costs are normally distributed. If 12 ovens are repaired, find theprobability that the mean of the oven repair will be greater than $60.A) 0.015B) 0.4850