Essential Mathematics Final Practice Exam Worksheet - Grade 12 Page 16
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506. Cassidy is trying to figure out what her mean monthly phone bill was for the previous
year. For four months, her phone bill was $52 a month. For the other eight months in the
year, her phone bill was $63 a month. Since the mean of $52 and $63 is $57.50, Cassidy
states that her mean phone bill for the previous year was $57.50. Is her reasoning correct?
Explain. (3 marks) (Module 7, Lesson 3)
7. Keegan is taking an Independent Study Grade 12 Physics course. He has received a mean
mark of 86% on his assignments, 77% on his midterm exam, and 65% on his final exam.
Assignments are worth 50% of his final mark, while the midterm exam is worth 20% and
the final exam is worth 30%. Determine Keegan’s final mark in this course. (3 marks)
(Module 7, Lesson 3)
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G r a d e 1 2 E s s e n t i a l M a t h e m a t i c s
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