Complete the following statements. the area under the curve associated with a z score of 3 is 0.

It's a mistake to say that the area under the standard normal curve associated with a z score of 3 is 0.  That area is actually slightly less than 1.

Using a old but good calculator with statistical functions:

normalcdf(-100, +3) = 0.999

answer: 60

step-by-step explanation:

1/2a + (2/3×30)   = 50

1/2a + 20 = 50

1/2a = 30

a = 60

1010: 3030

is it i think