At a certain university, the average attendance at basketball games has been 2,825. Due to the dismal showing of the team this year, the attendance for the first 11 games has averaged only 2,515 with a standard deviation of 485. The athletic director claims that the attendance is the same as last year. What is the test value needed to evaluate the claim?

answer

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

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