Scores on a test are normally distributed with a mean of 76 and a standard deviation of 6. Using the z-score table, estimate the probability a randomly selected student scored below a 64. Select one: O a. -0.02 b. 0.02 C. 0.98 d. 1.2

Find the area of the shaded region. The graph to the right depicts IQ scores of​ adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The area of the shaded region is ​(Round to four decimal places as​ needed.)

Fill in the blanks: Suppose you obtain a random sample of 400 apps from the population of all Google apps. Describe the distribution of the sample proportion. The standard deviation of the sampling distribution is places as needed.) (Round to three decimal

The frequency distribution was obtained using a class width of 0.5 for data on cigarette tax rates. Use the frequency distribution to approximate the population mean and population standard deviation. Compare these results to the actual mean u = $1.727 and standard deviation o = S1.041. E Click the icon to view the frequency distribution for the tax rates. Frequency distribution of cigarette tax rates The population mean is $ Tax Rate 0.00-0.49 0.50-0.99 1.00-1,49 1.50-1.99 2.00-2.49 2.50-2.99 3.00-3.49 3.50-3.99 Frequency D (Round to three decimal places as needed.) 5 15 The population standard deviation is S (Round to three decimal places as needed.) Compare these results to the values found using the actual data. O A. The grouped mean is slightly larger, while the grouped standard deviation is slightly smaller. O B. The grouped values are both slightly larger. O C. The grouped values are both slightly smaller. O D. The grouped mean is slightly smaller, while the grouped standard…

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Find the z-score for which 85% of the distribution's area lies to its right. O-1.96 O-2.04 O-1.04 O-0.39

IQ scores are normally distributed with a mean of 100 and standard deviation 16. Calculate the z-score for an IQ of 76. Include one decimal place in your answer. Add your answer

Find the margin of error for the given values of c, s, and n. c= 0.80, s = 2.6, n= 10 Click the icon to view the t-distribution table. The margin of error is (Round to one decimal place as needed.)

Find SAT Quartiles. SAT scores are reported on a scale from 600 to 2400. The mean is 1498 and the standard deviation is 316. The quartiles of any distribution are the values with cumulative proportions 0.25, and 0.75. What are the quartiles of the distribution of SAT scores?

A distribution of values is normal with a mean of 190 and a standard deviation of 4.Find the interval containing the middle-most 30% of scores: Enter your answer using interval notation. Example: (2.1,5.6)