Page 1 - Home Assignment- Ch-15 Probability
P. 1

SAI International School
                                                     CLASS - IX

               Mathematics
               CHAPTER-15: PROBABILITY

               HOME ASSIGNMENT
               1.    What is the probability of not hitting a six in a cricket match, if a batsman hits a
                     boundary six times out of 30 balls he played?
               2.             Outcomes               1      2      3      4      5      6

                              Frequency             12     18     14     26     14     16
                     Find the probability that the die shows a number greater than 4
                     a. 0.20                          b. 0.30                        c. 0.56                  d. None of these


               3.    A bag contains cards bearing numbers 2 to 101. Find the probability of getting a
                     prime number.

               4.     Which of the following can’t be the empirical probability of an event?
                        2
                                                       3
                      a.                     b.1                  c.                      d. 0
                        3                              2

               5.    What is the probability of (i) Impossible event (ii) Sure event?
               6.     A random survey of children of various age groups playing in a park was made. The
                      results are as follows:
                      Age Group             0-2 2-4 4-6 6-8 8-10 10-12 12-14 14-16 Total
                      Number of Children  5     6  4     7  6      10     9      3      50

                      Find the probability of a child of age group 6 - 12 playing in park on a particular day.


               7.     The record of meteorological station shows that out of past 450 consecutive days,
                      its temperature forecast was correct 75 times. What is the probability that on a
                      given day it was not correct?

               8.     A coin is tossed 64 times it shows 39 heads and 25 tails. What is the probability of
                      each outcome?



               9.    1500 families with 2 children were selected randomly, and the following data were
                     recorded:
                      Number of girls in a family             2            1              0

                      Number of families                     475            814              211
                               Compute the probability of a family, chosen at random, having


                               (i) 2 girls                  (ii) No girl
               10.  A bag contains 6 Red, 8 Black and 13 Blue balls. One ball is taken out of the bag at
                     random. Find the probability of getting a (i) a blue ball (ii) a yellow ball.


                                                            1
   1   2