The mean per capita income is 20,436 dollars per annum with a standard deviation of 839 dollars per annum. What is the probability that the sample mean would differ from the true mean by greater than 29 dollars if a sample of 352 persons is randomly selected?

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step-by-step explanation:

the answer is a.

135 and 80

step-by-step explanation:

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92