Gemma spun a spinner a total of 200 times and worked
out the estimated probability of it landing on black after
different numbers of spins. Her results are shown in the
table below.
a) What is the best estimate for the probability of
landing on black? Give your answer as a fraction in its
simplest form.
b) Copy and complete the sentence below, using one of
the options to explain why your answer to part a) is the
best estimate.
Number of spins
Estimated probability
5
1
5
This is the best estimate because it
involves the largest
number of trials
10
1
5
is the largest is the mean
is the smallest
20 100 200
1
17
11
4
100
50
involves the smallest
number of trials
is the mode