WASHINGTON STATE MATHEMATICS COUNCIL
1997 MIDDLE SCHOOL MATH OLYMPIAD
FIFTH GRADE PROBABILITY & STATISTICS
SCHOOL ___________________________ TEAM_______
1). Find the mean, mode, median and range of this set of math test scores:
Express mean to the nearest tenth.
75, 92, 88, 75, 100, 96, 88, 90, 88, 78, 86
Mean:___________ Mode: __________
Median:_________ Range: _________
2). From a standard deck of 52 cards, what is the probability of randomly
drawing a diamond or a queen?
3). A bag contains 5 red marbles, 3 green marbles, and 4 blue marbles.
How many green marbles must be added so that the probability of drawing
a green marble is 1/2?
4). How many ways can a family of 5 be arranged in a straight line for
a family portrait?
5). The field in the picture has shaded and unshaded regions. A helicopter
hovers over the field and drops a water balloon. What is the probability
that the balloon will land in a shaded area? Express your answer as a fraction
in simplest form.