Suppose a sample of 60 cans of soda has a mean of 121 ounces

Suppose a sample of 60 cans of soda has a mean of 12.1 ounces and a standard deviation of 0.05 ounces. If a can of sode has 12 ounces, what is its corresponding z-score?

subtract the mean from X and divide by the standard deviation.

in this case,
12 ounces - 12.1 ounces / .05 = -2

Therefore, your z-score is -2 standard deviations from the mean.