Math topic中文

Addition multiplication

addition and multiplication of probabilities (mutually exclusive events and independent events)

Practice questions

  1. 1A bag contains 12 balls. 2 of the balls are red, n are green balls and the rest are blue balls. Eunice takes two balls f…
  2. 2The following stem-and-leaf diagram shows the marks obtained by 20 pupils in a class test that has a total mark of 50. S…
  3. 3In a class of 36 students, each student is either in a sports team or a performing arts club. Each student is also eithe…
  4. 4Jane had a box filled with 8 red pens, 4 blue pens and 6 green pens. She took out two pens at random, one after the othe…
  5. 5The table shows the height, h cm, of 60 plants. Calculate an estimate of the standard deviation of the height of the pla…
  6. 6The probabilities of Andrew, Ben and Caleb passing the driving test are 35\frac{3}{5}, 23\frac{2}{3} and 34\frac{3}{4} r…
  7. 7The box-and-whisker plots show the distribution of the masses (in grams) of eggs sold in Shop A and Shop B. There are 25…
  8. 8设事件AA，BB相互独立，P(A)=0.6P\left(A\right)=0.6，P(B)=0.3P\left(B\right)=0.3，则P(AB‾∪A‾B)=()P(A\overline{B}∪\overline{A}B)=(\quad) A. 0.36                             0.36\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\: …
  9. 9A fitness centre has 16 employees. One of the 16 employees is selected at random. The probability that it is a woman wor…
  10. 10A carton contains 17 good apples and 3 rotten apples. A fruit seller picks three apples in random from the carton and pu…
  11. 11A survey was carried out to find the amount of money spent by 100 customers in a supermarket. This information was group…
  12. 12The cumulative frequency curve shows the distribution of marks scored by 180 students in a Mathematics examination in 20…
  13. 13A city has people with Blood Types as follows: Type O 45% Type A 40% Type B 11% Type AB 4% Two persons are selected at r…
  14. 14John flipped a coin five times and obtained five successive heads. Is it conclusive that the coin is biased? Explain you…
  15. 15The diagram shows a lucky draw spinner at a departmental store. The pointer is equally likely to stop at any of the sect…
  16. 16Five discs numbered 1, 3, 4, 6 and 7 are placed in a bag. Two disc are taken out of the bag at random without replacemen…
  17. 17The masses of 40 oranges were measured. The cumulative frequency curve below shows the distribution of the masses. Use t…
  18. 18Students in a class were asked how many siblings they have. The results are shown in the table. The modal number of sibl…
  19. 19A drawer contains 2 blue socks and 6 white socks. Two socks are taken from the drawer at random without replacement. If…
  20. 20The amount of mass loss in kilograms of 200 members was recorded by Amazing Fitness Centre over a one year period. The c…
  21. 21The histogram below shows the distribution of the scores of the participants from Potong Pasir Secondary School in a cur…
  22. 22In February 2021, a survey was carried out to find the number of days 500 patients stayed at a hospital. The graph shows…
  23. 23The time spent by 60 students on social media in a week is recorded. The cumulative frequency curve below shows the dist…
  24. 24In a shooting game, the player has to shoot with a gun to capture a monster. The bullet from the gun has to land on a ci…
  25. 25Bag A has 4 green counters, 6 red counters and 2 yellow counters. Alice takes a counter at random from Bag A, notes its…