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anonymous
 one year ago
Pizza delivery times at Pizza Time are normally distributed with a mean time of 27 minutes and a standard deviation of 3 minutes. Approximately what percent of pizzas are delivered between 24 and 30 minutes?
32%
68%
95%
99.7%
anonymous
 one year ago
Pizza delivery times at Pizza Time are normally distributed with a mean time of 27 minutes and a standard deviation of 3 minutes. Approximately what percent of pizzas are delivered between 24 and 30 minutes? 32% 68% 95% 99.7%

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@AG23 @nincompoop @horsegirl27 Can you please help me understand how to do these types of problems.?

CBARREDO1
 one year ago
Best ResponseYou've already chosen the best response.1Have you studied the Empirical Rule?

CBARREDO1
 one year ago
Best ResponseYou've already chosen the best response.1A statistical rule stating that for a normal distribution, almost all data will fall within three standard deviations of the mean. Broken down, the empirical rule shows that 68% will fall within the first standard deviation, 95% within the first two standard deviations, and 99.7% will fall within the first three standard deviations of the mean.

CBARREDO1
 one year ago
Best ResponseYou've already chosen the best response.1ok so we have to figure out how many standard deviations that given interval is from the mean the given interval is [24,30] so how many standard deviations are those 2 values from the mean, which is 27?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'm sorry, but what is a standard deviation.? I Quit school for a few purposes and here i am 3 years later and i just need a refreshing. Isn't that kind of like the mean of a data set.?

CBARREDO1
 one year ago
Best ResponseYou've already chosen the best response.1well 1 std dev = 3 so those values are 3 units away from the mean, right? and 1 std dev = 3 units so we want k here  [24, 30] = [273k, 27+3k] so we can solve either of these equations 24 = 27  3k or 30 = 27 + 3k so what is K? So that interval is considered "within 1 standard deviation of the mean"..ok? so that's what we use to get our answer from the empirical rule  A statistical rule stating that for a normal distribution, almost all data will fall within three standard deviations of the mean. Broken down, the empirical rule shows that 68% will fall within the first standard deviation, 95% within the first two standard deviations, and 99.7% will fall within the first three standard deviations of the mean. within the first std dev is the same as within 1 std dev 68% will fall within the first standard deviation that would be [273(3), 27+3(3)] within 3 std deviations this is within 1 standard deviation of the mean if the given interval was [18, 36] then it would be 99.7%

CBARREDO1
 one year ago
Best ResponseYou've already chosen the best response.1The answer would be 68%

CBARREDO1
 one year ago
Best ResponseYou've already chosen the best response.1It is a quantity calculated to indicate the extent of deviation for a group as a whole.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay sweet thank you (:

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I understand it now.
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