Samuel F.B. Morse (1791 – 1872), the creator of Morse Code, claimed that 12% of all letters used in the English language were “e”s. Suppose random samples of 196 letters are selected from a book. What is the probability that a random sample of 196 letters will contain less than 15% "e"s. Type your calculated z-score here. Express its value to the nearest hundredth (two decimal places). What is the probability that a random sample of 196 letters will contain at least 10% "e"s? Type your calculated z-score. Express its value to the nearest hundredth (two decimal places). Type your probability. Express its value to four decimal places.
Samuel F.B. Morse (1791 – 1872), the creator of Morse Code, claimed that 12% of all letters used in the English language were “e”s. Suppose random samples of 196 letters are selected from a book.
What is the
Type your calculated z-score here. Express its value to the nearest hundredth (two decimal places).
What is the probability that a random sample of 196 letters will contain at least 10% "e"s?
Type your calculated z-score. Express its value to the nearest hundredth (two decimal places).
Type your probability. Express its value to four decimal places.
According to a May 2020 Counterpoint Research report, 72% of all new mobile devices in North America were iOS devices. Suppose random samples of size 400 are selected. What are the mean and the standard deviation of the sampling distribution for the proportion of iOS devices in these samples? Standard devation should be expressed to the thousandths place (three decimal places).
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