Time spent usingâ e-mail per session is normallyâ distributed, with mu equals 10î¼=10 minutes and sigma equals 3ï=3 minutes. assume that the time spent per session is normally distributed. complete partsâ (a) throughâ (d). a. if you select a random sample of 5050 âsessions, what is the probability that the sample mean is between 9.89.8 and 10.210.2 âminutes?

ok

step-by-step explanation:

a: 1/6, j: 1/4

step-by-step explanation: you are welcome

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

mnkjn

step-by-step explanation: