Question 1 of 8true-false: select true or false and click "submit. any value that is unknown or can change is a variabletrueb. false

According to the normal model, what percent of receivers would you expect to gain fewer yards than 2 standard deviations below the mean number of yards

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12