It has been found that times taken by people to complete a particular tax form follow a normal distribution with mean 100 minutes and standard deviation 30 minutes. A random sample of nine people who have completed this tax form was taken.

a) What is the probability that the sample mean time taken is more than two hours?

b) The probability is 0.20 that the sample mean time taken is less than how many minutes?

c) What is the probability that the sample mean time taken is less than 70 minutes?

d) What is the probability that a randomly chosen individual takes less than 70 minutes to complete this

particular tax form?

i believe

step-by-step explanation:

from my conclusion c

nothjing

step-by-step explanation:

< xcy ≅ < xby

step-by-step explanation:

in δcax and δbax,

so, δcax ≅ δbax (side-angle-side or sas)

since δcax ≅ δbax, we can conclude < acx ≅ < abx

in δacy and δaby,

so, δacy ≅ δaby (side-angle-side or sas)

since δacy ≅ δaby, we can conclude < acy ≅ < aby

now,

< acy ≅ < aby

=> < acx + < xcy ≅ < abx + < xby

=> < acx + < xcy ≅ < acx + < xby   (since < acx ≅ < abx already proved above)

subtracting < acx from both sides, we get

< acx + < xcy -< acx ≅ < acx + < xby -< acx

cancelling out < acx and -< acx from both sides, we get

< xcy ≅ < xby (proved)

yes

step-by-step explanation:

they have to be opposite and reciprocal of eachother.