1. A teacher recorded the test marks for a
class of 20 students. Using these recorded
marks, the class average was calculated to
be 72. After this the teacher realises he
has recorded Michelle's mark incorrectly.
Michelle's mark was recorded as 36
when it should have been 86. What was
the correct average for the test?
2. A student using an electric calculator
mistakenly multiplies a number by 10 instead of
dividing by 10. The incorrect answer on display
is 600. If the student had done the correct operation,
what would the answer have been?
class of 20 students. Using these recorded
marks, the class average was calculated to
be 72. After this the teacher realises he
has recorded Michelle's mark incorrectly.
Michelle's mark was recorded as 36
when it should have been 86. What was
the correct average for the test?
2. A student using an electric calculator
mistakenly multiplies a number by 10 instead of
dividing by 10. The incorrect answer on display
is 600. If the student had done the correct operation,
what would the answer have been?
