Question

Average Monthly Temperature Month Temperature January 45 degrees February 42 degrees March 54 degrees April 62 degrees May 78 degrees June 85 degrees July 92 degrees August 94 degrees September 89 degrees October 78 degrees November 65 degrees December 54 degrees The average monthly temperatures for the city of Mathville are given in the chart above. One year was particularly warm, and the average temperature each month increased by 5°. What did this do to the average yearly temperature? A) The average remained the same. B) The average increased by 5°. C) The average decreased by 5°. D) The average increased by 60°.

Answer 1

Let 
x------------> the average yearly temperature

if One year was particularly warm, and the average temperature each month increased by 5°
in one year the temperature increased------->5*12-----> 60°
so
[the new average yearly temperature]=x+(60)*12-------> x+5°

therefore 

the answer is the option
B) The average increased by 5°.