Find the area under the standard normal distribution curve: between z = 0 and z = -2.14 To the left of z = -1.39 An American family of four washes an...
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Question

Find the area under the standard normal distribution curve:

  1. between z = 0 and z = -2.14
  2. To the

left of z = -1.39


An American family of four washes an average of 2000 pounds of clothes each year. The standard deviation of the distribution is 187.5 pounds.


3. Find the probability that a randomly selected family of four will be between 1980 and 1990 pounds.


Find the probability that the mean of a randomly selected sample of 50 families of four will be between 1980 and 1990 pounds.

Top Answer

1) P(0<z<-2.14)=0.4838 2)... View the full answer

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