Lori Cook has developed the following forecasting model:

hat$(y)=36\mathrm{.}0+4\mathrm{.}50x$

where hat$(y)=$ demand for Kool Air conditioners and

$x=$ the outside temperature $($degrees Fahrenheit$)$

a$)$ When the temperature outside is $70F,$ demand forecast $=$ air conditioners $($enter your response as an integer$).$Mark Gershon, owner of a musical instrument distributorship, thinks that demand for guitars may be related to the number of television appearances by the popular group Maroon $5$ during the previous month. Gershon has collected the data shown in the following table: