1. Cheatgrass (Bromustectorum) is an invasive species found in northern Arizona. The number of seeds produced by an acre of cheatgrass varies but follows a normal curve with a mean of 6 million seeds per acre, and a standard deviation of 0.5 million seeds per acre.

a) What percentage of cheatgrass acres produce between 5.0 and 7.0 million seeds?

b) What percentage of cheatgrass acres produces more than 5.5 million seeds?

c) What percentage of cheatgrass acres produces less than 6.0 million seeds?

What percentage of cheatgrass acres produce between 6.5 and 7.5 million seeds?

(Do not write the % symbol, just the value.)