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The mean amount purchased by a typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the following questions.
a. What is the likelihood the sample mean is at least $25.00?b. What is the likelihood the sample mean is greater than $22.50 but less than $25.00?c. Within what limits will 90 percent of the sample means occur?
Normal with a standard deviation of 0.3 inch. How does the diameter of an orange at the 67th percentile compare with the mean diameter?
A sample of 350 hats is selected and the sample mean is 3.25 pounds. Using a level of significance of .10, is there evidence that the population mean weight of the hats is greater than 3.5 pounds? Fully explain your answer.
If an urn is selected at random and a ball is drawn, find the probability it will be red.
Bougainvilleas, mean growth rate was 2.23 inches/week and sample standard deviation was 0.77 inches/week. Determine a 90% confidence interval for mean growth rate of all Bougainvilleas.
Test, at the 5% level of significance, whether the population standard deviation of hours spent studying is less than 10. Use the Critical value approach.
A sample of 100 orders revealed that 82 were delivered within the promised time. At the .10 significance level, can we conclude that less than 90 percent of the orders are delivered in less than 10 minutes?
Suppose that the number of calories in McDonald's Egg McMuffin is normally distributed random variable with mean of 290 calories and standard deviation of 14 calories.
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
The number of mathematics texts actually chosen, construct a table showing the values of the joint probability distribution of x and y.
In addition, the gender of the respondent is noted. After analyzing the results the following table of joint probabilities was produced: Find the probability that a customer who rates Windsor as excellent is a man. 0.45
Linear programming problems. Computethe following linear programming problem. Among which of the following points (X,Y) is feasible.
The data results are based on serum continine levels for each group. The claim is that exposure to tobacco smoke (as second-hand smoke) corresponds to higher levels of cotinine.
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