Which percentage is the right answer

This is a bad question.

The real answer is any of them may be the actual percentage, the true population mean.  Probability and statistics often don't rule events out entirely; they just tell us some events are very unlikely.  For example here all we know is there's a 95% chance the true percentage is within .  But there's a 5% chance it isn't, so those other percentages are still possible.

The question seems to want to ask which percentage falls within the 95% confidence interval.  That's between 78-8=70% and 78+8=86% so the answer is

C 72%

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1

50 min

step-by-step explanation:

they will be decreasing both their times in half

60 / 2 = 30

40/2 = 20

30 + 20 = 50