What is the equation of the line that passes through the point (-4,8) and has a slope of -1/4

The contents of 3838 cans of coke have a mean of x¯¯¯=12.15x¯=12.15. assume the contents of cans of coke have a normal distribution with standard deviation of σ=0.12.σ=0.12. find the value of the test statistic zz for the claim that the population mean is μ=12.μ=12.

What percent of the circle below is shaded?

What’s the answer ? use the picture to see the problem