匿名
匿名 發問於 科學及數學數學 · 6 年 前

Standard normal distrubition

A software house found that the project value received over the past year were approximately normally distributed, with a mean of $43,000 and a standard deviation of $8,500. Suppose the project value remains the same next year.

(a)What proportion of new projects would you expect to be $35,000 or less? (2 marks)

(b)What proportion of new projects would you expect to be between $30,000 and $45,000?

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