Chapter 6: Q.6.7 (page 372)
If the area to the left of is , then what is the area to the right?
Short Answer
The area to the right of is
Chapter 6: Q.6.7 (page 372)
If the area to the left of is , then what is the area to the right?
The area to the right of is
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Get started for freeIn China, four-year-olds average three hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.5 hours and the amount of time spent alone is normally distributed. We randomly select one Chinese four-year-old living in a rural area. We are interested in the amount of time the child spends alone per day.
a. In words, define the random variable X.
b. X ~ _____(_____,_____)
c. Find the probability that the child spends less than one hour per day unsupervised. Sketch the graph, and write the probability statement.
d. What percent of the children spend over ten hours per day unsupervised?
e. Seventy percent of the children spend at least how long per day unsupervised?
How would you represent the area to the left of one in a probability statement?
About what percent of the x values from a normal distribution lie within two standard deviations (left and right) of the mean of that distribution?
What is the z-score of x= –, if it is standard deviations to the right of the mean?
The length of time it takes to find a parking space at 9 A.M. follows a normal distribution with a mean of five minutes and a standard deviation of two minutes.
Seventy percent of the time, it takes more than how many minutes to find a parking space?
a. 1.24
b. 2.41
c. 3.95
d. 6.05
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