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anonymous
 one year ago
Help with some normal distribution problems?
anonymous
 one year ago
Help with some normal distribution problems?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The time required to finish a test is normally distributed with a mean of 60 minutes and a standard deviation of 10 minutes. What is the probability that a student will finish the test in less than 70 minutes?

sloppycanada
 one year ago
Best ResponseYou've already chosen the best response.3Do you have a normal distribution chart in front of you?

sloppycanada
 one year ago
Best ResponseYou've already chosen the best response.3So 60 is going to be that center little bit, excuse my terrible drawing. dw:1435375646432:dw

sloppycanada
 one year ago
Best ResponseYou've already chosen the best response.3A standard deviations is another line. Like this (but your graph is neater). Since each of the standard deviations is 10, All you care about is The line right after the mean and before. dw:1435375698631:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So what's the probability that it will be less that 70 minutes

sloppycanada
 one year ago
Best ResponseYou've already chosen the best response.3Add all those percentages from 70% to 0.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I got 69.1% is the correct?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.02. The time required to finish a test is normally distributed with a mean of 60 minutes and a standard deviation of 10 minutes What is the probability that a student will finish the test between 50 and 60 minutes?

sloppycanada
 one year ago
Best ResponseYou've already chosen the best response.3Same thing, So the standard deviation is 10. And you're looking at just between 5060. your answer is the question mark. dw:1435376877515:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The time required to finish a test is normally distributed with a mean of 60 minutes ad a standard deviation of 10 minutes. What is the Zscore for a student who finishes the test in 45 minutes?

sloppycanada
 one year ago
Best ResponseYou've already chosen the best response.3dw:1435378336477:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I got 3/2 is the correct?

sloppycanada
 one year ago
Best ResponseYou've already chosen the best response.3Yeah, that's right.
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