QUESTION 20 Suppose ferrets have a mean lifespan of 9.2 years with a standard deviation of 2.13 years. What is the probability that a ferret will live longer than 8.7 years? Z-Score = -0.23 (to the nearest hundredth) Work: 8.7-9.2/2.13 = -0.2347 Identify the image below that best represents the standard normal curve you drew for this problem. D D Area from the Table: Work: Final Answer:

Use Excel to find the z-scores that bound the middle 66% of the area under the standard normal curve. Enter the answers in ascending order. Round the answers to two decimal places. The z-scores for the given area are Part 1 of 3 Big chickens: The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1433 grams and standard deviation 170 grams. Use the TI-84 Plus calculator to answer the following. (a) What proportion of broilers weigh between 1163 and 1243 grams? (b) What is the probability that a randomly selected broiler weighs more than 1502 grams? (c) Is it unusual for a broiler to weigh more than 1600 grams? Round the answers to at least four decimal places. The proportion of broilers that weigh between 1163 and 1243 grams is Part 2 of 3 and Part 3 of 3 Ś The probability that a randomly selected broiler weighs more than 1502 grams is (Choose one) Yes No X because the probability that a broiler weighs more than 1600 grams is X 5 5 X 5

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In a particular statistics exam, the 35th percentile of final exam score is 42, and the 70th  percentile of final exam score is 76. A histogram of the scores approximately follows the normal curve. What is the approximate standard deviation of the final exam scores? Hints: What is the z value in the normal table that gives you closest to 35% of the area between -z and z? Now what does that tell you about the number of SDs in between 42 inches and 76 inches? You might find it helpful to draw a picture of the normal curve with original units and standard units. Group of answer choices a. 7.5 b. 13.1 c. 20.7 d. 37.8

Find each of the shaded areas under the standard normal curve using a TI-84 calculator. Round the answers to four decimal place: Part 1 of 4 The area of the shaded region is Part 2 of 4 The area of the shaded region is 1. Part 3 of 4 -0.96 Part 4 of 4 -0.35 The area of the shaded region is 0.56 1.56 X X 1.89 2.23 5 5 S

Question 3 A population of values has a normal distribution with u = 209.1 and o = 69.2. You intend to draw a random sample of size n 12. Find the probability that a single randomly selected value is greater than 215.1. P(X > 215.1) = Find the probability that a sample of size n = 12 is randomly selected with a mean greater than 215.1. P(M > 215.1) = Enter your answers as numbers accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted. Question Help: Video D Post to forum ICalculator Submit Question MacBook Pro

Question 8 of 38 -/3 E View Policies Let x be a continuous random variable that follows a normal distribution with a mean of 200 and a standard deviation 25. Find the value of x so that the area under the normal curve between a and x is approximately 0.4798 and the value of x is greater than u. Round your answer to two decimal places. Attempts: 0 of 2 used Using multiple attempts will impact your score. 10% score reduction after attempt 1

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.6 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 14 samples is 4.9 ppm with a variance of 1.2 Does the data support the claim at the 0.01 level? Assume the population distribution is approximately normal. Step 2 of 5 :   Find the value of the test statistic. Round your answer to three decimal places.

Question 15