11 kysymystä

Zombie-Outbreak Probability

Year 9 · single events from a bowl of mixed sweets, expected frequency and two-pick tree diagrams with replacement, with the bowl and spinner shown. Answers as fractions in simplest form.

Kysymykset

11 kysymystä tässä versiossa · Oikeat vastaukset on piilotettu, jotta voit testata itseäsi ensin.

  1. 1Kysymys 1

    The bowl holds these ten sweets. One is picked at random. What is the probability it is a toffee (the wrapped sweet)?

    Ten sweets in two rows: five wrapped toffees on the top row, then three lollipops and two chocolate bars on the bottom row.
    A1/2
    B1/5
    C3/10
    D1/10
  2. 2Kysymys 2

    From the same bowl of 10, what is the probability that the pick is not a chocolate?

    A1/5
    B4/5
    C2/10
    D3/5
  3. 3Kysymys 3

    From the same bowl of 10, what is the probability of picking a lollipop or a chocolate?

    A1/5
    B3/5
    C1/2
    D1/6
  4. 4Kysymys 4

    A sweet is picked from the bowl of 10 and put back, 40 times. How many toffees would you expect?

    A10
    B20
    C8
    D25
  5. 5Kysymys 5

    A fair spinner has eight equal sections, shown in order. What is the probability of landing on a bat?

    Eight spinner sections in a row: three pumpkins, then two bats, then three ghosts.
    A1/8
    B3/8
    C2/6
    D1/4
  6. 6Kysymys 6

    The same spinner is spun 120 times. How many times would you expect a ghost?

    A45
    B40
    C30
    D15
  7. 7Kysymys 7

    The shaded part of the bar shows the fraction of a party bag that is chocolate. What is the probability of picking a chocolate from the bag, in simplest form?

    A bar divided into twelve equal parts, with the first three parts shaded.
    A3/12
    B1/4
    C1/3
    D3/9
  8. 8Kysymys 8

    Two sweets are picked from the bowl of 10, with replacement. What is the probability that both are toffees?

    A1/2
    B1
    C1/4
    D1/8
  9. 9Kysymys 9

    Two sweets are picked with replacement. What is the probability of a chocolate first and then a lollipop?

    A1/2
    B3/50
    C5/10
    D6/10
  10. 10Kysymys 10

    The probability of rain on Halloween night is 0.3. What is the probability that it does not rain, as a fraction?

    A3/10
    B1/3
    C1/7
    D7/10
  11. 11Kysymys 11

    In a zombie escape game each player has a 2/5 chance of escaping. If 60 people play, how many would you expect to escape?

    A36
    B12
    C24
    D30

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