Given that z^20 = -2 and z^50 = -1, which of the following do you know?
•The variance is 10.
•The standard deviation is 30.
•The mean is 80.
•The median is 40.
•The data point x = 20 is 2 standard deviations from the mean.
•The data point x = 50 is 1 standard deviation from the mean.
•The data point x = 45 has a z-value of 1.5.

b,c,e,f on edge

Step-by-step explanation:

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.