Given below are two quantities named A and B. Based on the given information, you have to determine the relation between the two quantities. You should use the given data and your knowledge of Mathematics to choose between the possible answers.
Quantity A: The average marks secured by 70 boys were 84. But it was discovered that an item 99 was misread as 66. What is the correct mean of marks?
Quantity B: A student scored 77, 56, 85, 100, 99, 72 and 89 respectively in all the subjects. What is the average score obtained by him?