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Chapter 7 Section 2 Questions 1-1, Statistic Homework Help
Subject
Mathematics
Question Description
1) Determine the area under the standard normal curve that lies to the left of (a)Z=1.31 (b)Z=1.06 (c)Z=0.57 and (d)Z=0.14.
2) Determine the area under the standard normal curve that lies to the right of (a)Z=0.64 (b)Z=-1.78 (c)Z=0.93 and (d)Z=0.59
3) Determine the area under the standard normal curve that lies between (a)Z=-0.64 and Z=0.64, (b)Z=-2.38 and Z=0, and (c) Z=-0.65 and Z=1.23
4) Find the Z-score such that the area under the standard normal curve to the right is 0.15
5) Find the z-scores that separate the middle 95% of the distribution from the area in the tails of the standard normal distribution.
6) Find the value of zα α=0.18
7) Assume the random variable X is normally distributed with mean μ=50 and standard deviation
σ=77 Find the 97th percentile.
8) The mean incubation time for a type of fertilized egg kept at 100.33°F is 22 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 2 days.
(a)What is the probability that a randomly selected fertilized egg hatches in less than
20 days?
(b) What is the probability that a randomly selected fertilized egg takes over
24 days to hatch?
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