What is 10 divided my 19

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.

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Describe the domain and range of y=2(3)^x-2+5