Auniversity claims that the mean time professors are in their offices for students is at least 6.5 hours each week. a random sample of eight professors finds that the mean time in their offices is 6.2 hours each week. with a sample standard deviation of 0.49 hours from a normally distributed data set, can the university’s claim be supported at α=0.05?

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2 equivalent expressions to represent the area of a rectangle and the top is n-3 and the side is 2

area of the rectangle = length * width

given length = n - 3

width = 2

replace it in the area

so area of the rectangle = (n-3) *2

= 2(n-3)

one of the expression is 2(n-3)

to get another expression we distribute 2 inside the parenthesis

2(n-3) is 2n - 6

so another expression is 2n - 6

two equivalent expression are

2(n - 3)   , 2n - 6