Mathematics, 09.08.2019 17:20, u8p4
Acompany manufactures tennis balls. when its tennis balls are dropped onto a concrete surface from a height of 100 inches, the company wants the mean height the balls bounce upward to be 55.4 inches. this average is maintained by periodically testing random samples of 25 tennis balls. if the t-value falls between minus−t 0.90 and t 0.90, then the company will be satisfied that it is manufacturing acceptable tennis balls. a sample of 25 balls is randomly selected and tested. the mean bounce height of the sample is 56.6 inches and the standard deviation is 0.25 inch. assume the bounce heights are approximately normally distributed.
is the company making acceptable tennis balls?
Answers: 2
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Solve the given system of equations. 2y= -x+9 , 3x-6= -15
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65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?
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