Question
Marco throws a six-sided dice 27 times.
The bar chart shows his results.
(a) Write down the mode.
(b) Work out the probability that Marco throws a number less than 5.
(c) Calculate the mean.
Answer/Explanation
Ans:
(a) 4 cao
(b) \(\frac{21}{27}\) oe isw
(c) 3.33(3…)
Question
The probability of Sachin’s team winning any match is 0.45.
(a) Write down the probability of Sachin’s team not winning any match.
(b) In a season there are 40 matches.
How many matches should Sachin’s team expect to win in a season?
Answer/Explanation
Ans:
(a) [0].55 oe
(b) 18
Question:
The probability that Raju arrives on time at school is 0.72 .
(a) Write down the probability that he will not arrive on time.
(b) Raju attends school on 200 days.
Work out the expected number of days he will arrive on time.
Answer/Explanation
(a) 0.28
(b) 144
Question
In a group of students the probability that a student is left-handed is 0.28 .
A student is chosen at random from the group.
Find the probability that this student is not left-handed.
Answer/Explanation
Ans:
[0].72 oe
Question
A bag contains 50 counters.
10 of the counters are red.
One of the counters is taken from the bag at random.
(a) Draw an arrow (↓ ) on the scale to show the probability that this counter is red.
(b) Find the probability that the counter is not red.
Answer/Explanation
(a) Arrow at 0.2
(b) 0.8