Answer:
B
Step-by-step explanation:
the mean is calculated as
mean = [tex]\frac{sum}{count}[/tex]
this year's mean = [tex]\frac{7+3.3+2}{3}[/tex] = [tex]\frac{12.3}{3}[/tex] = 4.1
last year's mean = [tex]\frac{5.3+1.6+2.4}{3}[/tex] = [tex]\frac{9.3}{3}[/tex] = 3.1
difference = 4.1 - 3.1 = 1
