7. 8 9. 10 11 12 13 14 From the probability distribution, find the mean and standard deviation for the random variable x, which represents the number of cars per household in a town of 1000 households. x P(x) 0 0.145 1 0.408 2 0.264 3 0.100 4 0.083 OH=1.568; o=1.111 OH=1.568; o=1.893 OH=1.866; o= 1.111 O None of these Continue Submit Assignment O 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use| Privacy Center| Accessibility

The probability that a radish seed will germinate is 0.7. A gardener plants seeds in batches of 9. Find the standard deviation for the binomial random variable X, the number of seeds germinating in each batch Round to three decimals A. 1.375. OB. 1.296 O C. 1.281 OD. 1.358

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Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with ? = 2.5%. A random sample of 10 bank stocks gave the following yields (in percents). 5.7     4.8     6.0     4.9     4.0     3.4     6.5     7.1     5.3     6.1 The sample mean is  = 5.38%. Suppose that for the entire stock market, the mean dividend yield is ? = 4.9%. Do these data indicate that the dividend yield of all bank stocks is higher than 4.9%? Use ? = 0.01.   (c)  Find (or estimate) the P-value. (Enter a number. Round your answer to four decimal places.) ?Sketch the sampling distribution and show the area corresponding to the P-value. (Select the correct graph.)

7.34 Suppose that for a given computer salesperson, the probability distribution of x = the number of systems sold in 1 month is given by the following table: 1 2 3 4 5 6 7 .05 .10 .12 .30 .30 .11 .01 .01 8 p(x) a. Find the mean value of x (the mean number of systems sold). b. Find the variance and standard deviation of x. How would you interpret these values? c. What is the probability that the number of systems sold is within 1 standard deviation of its mean value? d. What is the probability that the number of systems sold is more than 2 standard deviations from the mean? (Hint: See Example 7.13.)

The weights of a certain population of young adult females are approximately normally distributed with a mean of 132 pounds and a standard deviation of 15. Find the probability that a subject selected at random from this population will weigh less than 122 pounds O a. 0.7486 O b. 0.2514 Oc. 0.2486 O d. 0.2570

Suppose a sample of O-nings waS obtained and the wall thickness (in inches) of each was recorded. Use a normal probability plot to assess whether the sample data could have a a come from a population that is normally distnbuted. 0.190 0.194 0.199 0.205 E 0. 0.214 0.213 0.233 0.249 0.264 0.276 0.288 0.292 306 0.308 0.311 0.317 Click here to vew the table of cntical values for normal probability_plots] to Click here to view page 1 of the standard normal distribution table Click here to vew page 2 of the standard normal distribution table 2 b ◦ Using the correlation coeficient of the normal probability plot, is it reasonable to conclude that the population is normally distnibuted? Select the correct choice below and fll in the answer boxes within your choice. (Round to three decimal places as needed.) ○ A. Yes. The correlation between the expected z-scores and the observed data, Therefore, it is not reasonable to conclude that the data come from a noral population. exceeds the critical…