In a large university, the average age of all the students is 24 years with a standard deviation of 9 years. a random sample of 36 students is selected. a) determine the standard error of the mean. b) what is the probability that the sample mean will be larger than 19.5? c) what is the probability that the sample mean will be between 25.5 and 27 years?

The table shows population statistics for the ages of best actor and best supporting actor winners at an awards ceremony. the distributions of the ages are approximately bell-shaped. compare the z-scores for the actors in the following situation. best actor best supporting actor muequals42.0 muequals49.0 sigmaequals7.3 sigmaequals15 in a particular year, the best actor was 59 years old and the best supporting actor was 45 years old. determine the z-scores for each. best actor: z equals best supporting actor: z equals (round to two decimal places as needed.) interpret the z-scores. the best actor was (more than 2 standard deviations above more than 1 standard deviation above less than 1 standard deviation above less than 2 standard deviations below) the mean, which (is not, is) unusual. the best supporting actor was (less than 1 standard deviation below more than 1 standard deviation above more than 2 standard deviations below more than 1 standard deviation below) the mean, which (is is not) unusual.

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122