Cambridge IGCSE · Mathematics

Statistics and probability

30 practice questions, each with the answer and an explanation.

Practise Statistics and probability now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 30 questions

The mean of five numbers is $11$ . Four of the numbers are $10, 7, 13, 12$ . What is the fifth number?
The mean of five numbers is $9$ . Four of the numbers are $5, 3, 4, 6$ . What is the fifth number?
The mean of five numbers is $14$ . Four of the numbers are $14, 10, 12, 12$ . What is the fifth number?
The mean of five numbers is $15$ . Four of the numbers are $9, 21, 12, 15$ . What is the fifth number?
The mean of five numbers is $19$ . Four of the numbers are $15, 25, 17, 18$ . What is the fifth number?
The mean of five numbers is $15$ . Four of the numbers are $10, 15, 11, 9$ . What is the fifth number?
What is the median of the data set $28, 37, 50, 58, 29$ ?
What is the median of the data set $29, 48, 20, 53, 31$ ?
What is the median of the data set $42, 33, 40, 38, 43$ ?
What is the median of the data set $22, 23, 12, 4, 13$ ?
A bag holds $4$ red, $2$ blue and $4$ green marbles. One marble is picked at random. What is the probability it is red?
A bag holds $3$ red, $6$ blue and $5$ green marbles. One marble is picked at random. What is the probability it is red?
A bag holds $8$ red, $3$ blue and $6$ green marbles. One marble is picked at random. What is the probability it is red?
A bag holds $4$ red, $6$ blue and $1$ green marbles. One marble is picked at random. What is the probability it is red?
A bag holds $6$ red, $7$ blue and $1$ green marbles. One marble is picked at random. What is the probability it is red?
The mean of five numbers is $23$ . Four of the numbers are $28, 22, 25, 22$ . What is the fifth number?
The mean of five numbers is $29$ . Four of the numbers are $27, 27, 31, 32$ . What is the fifth number?
The mean of five numbers is $16$ . Four of the numbers are $12, 20, 12, 14$ . What is the fifth number?
The mean of five numbers is $15$ . Four of the numbers are $10, 11, 14, 20$ . What is the fifth number?
The mean of five numbers is $9$ . Four of the numbers are $8, 11, 10, 11$ . What is the fifth number?
The mean of five numbers is $25$ . Four of the numbers are $19, 24, 25, 28$ . What is the fifth number?
What is the median of the data set $21, 7, 42, 50, 39$ ?
What is the median of the data set $18, 51, 20, 59, 47$ ?
What is the median of the data set $35, 9, 44, 23, 54$ ?
What is the median of the data set $3, 56, 46, 10, 24$ ?
A bag holds $7$ red, $2$ blue and $5$ green marbles. One marble is picked at random. What is the probability it is red?
A bag holds $5$ red, $5$ blue and $4$ green marbles. One marble is picked at random. What is the probability it is red?
A bag holds $3$ red, $7$ blue and $4$ green marbles. One marble is picked at random. What is the probability it is red?
The table shows the times $t$ minutes taken by $20$ students: $0 < t \leq 10$ : frequency $4$ ; $10 < t \leq 20$ : frequency $9$ ; $20 < t \leq 40$ : frequency $7$ . What is an estimate of the mean time, in minutes?
A bag holds $5$ red, $8$ blue and $6$ green marbles. One marble is picked at random. What is the probability it is red?

Keep practising

Statistics and probability in other exams

Ready for the full Cambridge IGCSE test?

Take a mock test Cambridge IGCSE hub