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ICSE-VIII-Mathematics

23: Probability Class 8 Maths

with Solutions - page 2
Qstn# 14 Prvs-QstnNext-Qstn
  • #14
    Two coins are tossed together. What is the probability of getting: (i) at least one head (ii) both heads or both tails.
    Ans : ∵ A coins has two faces Head and Tailor H, T
    ∴ Two coins are tossed
    ∴ Number of coins = 2 x 2 = 4
    which are HH, HT, TH, TT (i) At least one head, then
    Number of outcomes = 3
    ∴ P(E) = (Number of favourable outcome)/(Number of all possible outcome)
    = 3/4 (ii) When both head or both tails, then
    Number of outcomes = 2
    ∴ P(E) = (Numberof favourable outcome)/(Number of all possible outcome)
    = 2/4
    = 1/2
  • #14-i
    at least one head
    Ans : At least one head, then
    Number of outcomes = 3
    ∴ P(E) = (Number of favourable outcome)/(Number of all possible outcome)
    = 3/4
  • #14-ii
    both heads or both tails.
    Ans : When both head or both tails, then
    Number of outcomes = 2
    ∴ P(E) = (Numberof favourable outcome)/(Number of all possible outcome)
    = 2/4
    = 1/2