英数题：Five test scores have a mean(average score)of 90,a median"(middle score)of 91 and a mode
Five test scores have a mean(average score)of 90,a median"(middle score)of 91 and a mode(most frequent score)of 94.The sum of the two lowest test score is__________
(A)170 (B)171 (C)176 (D)177 (E)not determined by the information giver