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4) Tina's teacher gives a 20 point quiz every Friday. On her first five quizzes, Tina has scores of 15, 4, 16, 18,
and 15. After the seventh quiz, her mean score is 15. What is the median?
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5) At the brand new middle school lockers open with PIN numbers instead of combination locks. PIN numbers consist of three one digit numbers and digits can repeat. This year all the 7th grade PIN numbers begin with 3, 4 or 5, but the other two can be any number from 0 up to 9. How big does the 7th grade class
have to be to guarantee at least two students have the same PIN numbers?
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