Biomass Studies indicate that the earth’s vegetative mass, or biomass for tropical...

Biomass Studies indicate that the earth’s vegetative mass, or biomass for tropical woodlands, thought to be about 35 kilograms per square meter . Suppose you measure the tropical biomass in 400 randomly selected square-meter plots.

a. Approximate σ, the standard deviation of the biomass measurements.

b. What is the probability that your sample average is within two units of the true average tropical biomass?

c. If your sample average is ̅x= 31.75, what would you conclude about the overestimation that concerns the scientists?