Students in a fifth-grade class were given an exam. During the next 2 years, the same students were retested several times. The average score was given by the model f(t) = 95-11 log10 (t + 1), 0 ?t? 24where t is the time in months.Enter your answer as a decimal, rounded to one decimal place. Do part a without a calculator, but use a calculator for parts b and c.(a) What is the average score on the original exam?(b) What was the average score after 6 months?(c) What was the average score after 18 months?