Tahsili SAAT (Saudi Arabia) · Mathematics

Statistics, probability and sequences

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

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

All 14 questions

  1. Class A has 26 students with a mean mark of 73; class B has 30 students with a mean mark of 60. What is the mean mark of all the students?
  2. Class A has 26 students with a mean mark of 63; class B has 34 students with a mean mark of 69. What is the mean mark of all the students?
  3. Class A has 19 students with a mean mark of 69; class B has 32 students with a mean mark of 85. What is the mean mark of all the students?
  4. Class A has 21 students with a mean mark of 79; class B has 15 students with a mean mark of 88. What is the mean mark of all the students?
  5. Class A has 12 students with a mean mark of 57; class B has 37 students with a mean mark of 88. What is the mean mark of all the students?
  6. Two fair dice are rolled. What is the probability that the sum is 9?
  7. Two fair dice are rolled. What is the probability that the sum is 6?
  8. Two fair dice are rolled. What is the probability that the sum is 3?
  9. In how many ways can a committee of 3 be chosen from 10 people?
  10. In how many ways can a committee of 2 be chosen from 9 people?
  11. In how many ways can a committee of 2 be chosen from 10 people?
  12. A geometric sequence starts 1, 2, 4, ... What is the 6th term?
  13. Simplify 2^3 x 2^2.
  14. Simplify 2^4 x 2^3.

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