Question

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10.
Reference: Ref 9-11

If a January day in Columbus is randomly selected, what is the probability that the high temperature is between 15 and 25 degrees?
A. .2743
B. .6554
C. .3811
D. almost 1

Answer 1

The probability is 0.3 that a randomly selected January day in Columbus will have a high temperature greater than _______ degrees. Which number completes the sentence correctly?
A. 26.2
B. 15.8
C. 21.52
D. none of the above


I say B and D?

Answer 2

B is not correct for the first one

D is not correct for the second one

Answer 3

mehhehehhe :'(.

Answer 4

do you have a TI calculator (preferably TI-83, TI-84)?

Answer 5

nope :(.

Answer 6

how did you get your answer then

Answer 7

educatred guess :D.

Answer 8

are you allowed to use wolfram alpha?

Answer 9

if so, then here's what you type for the first one

http://www.wolframalpha.com/input/?i=normalcdf%2815%2C25%2C21%2C10%29

Answer 10

SO c for the first one?

Answer 11

yes

Answer 12

for the second one, you type in this

http://www.wolframalpha.com/input/?i=invnormal%280.3%2C21%2C10%29

Answer 13

is A the next answer?

Answer 14

you got it