Plz help me somebody, anybody. my questions always get skipped over!

Standard deviation of 19,29,21,22,23

Will mark ! (10 points also! ) if x varies inversely with y and x =6 when equals y= 10, find y when x=8 a. y=4.8 b. y=7.5 c. y=40/3 d. y=4/15

The cost of two tables and three chairs is $705. if the table costs $40 more than the chair,find the cost of the table and the chair