20 POINTS SHOW WORK The average number of hours of sleep that students in a particular statistics class on a given night follows a Normal model with a mean of 6.2 hours and a standard deviation of 1.5 hours. What is the interquartile range for the hours of sleep?

wait nvm i know the correct answer now its 100%   81 square feet

~batmans wife dun dun

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81