Use the z-table to determine the following probabilities. Sketch a normal curve for each problem with the
appropriate probability area shaded.
1. P(z > 2.34)
2. P(z < -1.56)
3. P(z = 1.23)
4. P(-1.82 < z < 0.79)
5. Determine the z-score that corresponds with a 67% probability.
Read the following scenario:
Park Rangers in Yellowstone National Park have determined that fawns less than 6 months
old have a body weight that is approximately normally distributed with a mean μ = 26.1 kg
and standard deviation σ = 4.2 kg. Let x be the weight of a fawn in kilograms.
Complete each of the following steps for the word problems below:
• Rewrite each of the following word problems into a probability expression, such as
P(x > 30).
• Convert each of the probability expressions involving x into probability expressions
involving z, using the information from the scenario.
• Sketch a normal curve for each z probability expression with the appropriate
probability area shaded.
• Solve the problem.
1. What is the probability of selecting a fawn less than 6 months old in Yellowstone that weighs less
than 25 kilograms?
2. What is the probability of selecting a fawn less than 6 months old in Yellowstone that weighs more
than 19 kilograms?
3. What is the probability of selecting a fawn less than 6 months old in Yellowstone that weighs between
30 and 38 kilograms
4. If a fawn less than 6 months old weighs 16 pounds, would you say that it is an unusually small
animal? Explain and verify your answer mathematically.
5. What is the weight of a fawn less than 6 months old that corresponds with a 20% probability of being
randomly selected? Explain and verify your answer mathematically