How would you use friendly numbers to estimate 61 ÷ 8.8

30 is 6 multiplied by a number y as a equation

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.

Use sigma notation to represent the following series for 9 terms.