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What is the quotient of 42/3 divided by 4 1/5

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.

In which form is the following function written? y = - 2(x – 3)(x + 5)