A number x rounded to 2 significant figures is 1300 write down the error interval for x

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Look at attachment. has all info needed. need

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60