If X is normally distributed with a mean of 70 and a standard deviation of 4.55. If you take a sample of size 120, what is the standard deviation of the sampling distribution? Write your answer correct to 4 decimal places.

Assume that adults have IQ scores that are normally distributed with a mean of u = 105 and a standard deviation a = 15. Find the probability that a randomly selected adult has an IQ between 91 and 119. Click to view page 1 of the table. Click to view page 2 of the table. The probability that a randomly selected adult has an IQ between 91 and 119 is. (Type an integer or decimal rounded to four decimal places as needed.) Enter your answer in the answer box. MacBook Air esc 888 %23 & 2 3 4 5 6 7 8 Q E R T Y tab P A D G H caps lock K V в N M > ? control option command command option

For parts a and​ b, use the t​ tables, software, or a calculator to estimate. For parts c and​ d, use software or a calculator to estimate. ​a) the critical value of t for a 95​% confidence interval with df=15. ​b) the critical value of t for a 90​% confidence interval with df=61. ​c) the​ P-value for t≥1.66 with 10 degrees of freedom. ​d) the​ P-value for t>2.46 with 24 degrees of freedom. LOADING... Click the icon to view the t table. ​a) What is the critical value of t for a 95​% confidence interval with df=15​?   nothing ​(Round to two decimal places as​ needed.) ​b) What is the critical value of t for a 90​% confidence interval with df=61​?   nothing ​(Round to two decimal places as​ needed.) ​c) What is the​ P-value for t≥1.66 with 10 degrees of​ freedom?   nothing ​(Round to three decimal places as​ needed.) ​d) What is the​ P-value for t>2.46 with 24 degrees of​ freedom?   nothing ​(Round to three decimal places as​ needed.)

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Find the indicated IQ score. 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. Click to view page 1 of the table. Click to view page 2 of the table. The indicated IQ score, x, is (Round to one decimal place as needed.) X 0.75 0