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A data set is normally distributed with a mean of 42 and a standard deviation of 9. What percent of the data values lie between 15 and 60?

Respuesta :

Answer:

97.59%.

Step-by-step explanation:

z-score for  data value 15 = (15-42) / 9

= -3.

z-score for data value (60 - 42) /9

= 2.

Using the standard normal tables we get:

= 0.4772- ( - 0.4987)

= 0.9759.

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