Plzz. Answer.. Q. No. 10 to 12

​Q10. In figure ​ PQR = 100° where P, Q and R are points on the circle with centre O. Find ​ POR in the quadrilateral
Q11. The length, breadth and height of a room are 5 m, 4 and 3 m respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of Rs.7.50 per m2.

Q12. Two coins are tossed simultaneously 500 times, and we get 
          Two heads : 105 times,              One head : 275 times,
        Find the probability of occurrence of each of these events.

Dear Student,

Q12. Let E be the event of getting two heads in 500 tosses of two coins, and F be the event of getting one head in 500 tosses of two coinsNow, total no. of outcomes = 500, two heads come up 105 times and one head comes up 275 times.Then, PE = No. of favourable outcomesTotal no. of outcomes = 105500 = 2101000 = 0.21and PF = No. of favourable outcomesTotal no. of outcomes = 275500 = 0.55

​Hope this information will clear your doubts about topic.

​For the remaining queries, we request you to post them in different threads to have rapid assistance from our experts.

​If you have any more doubts, please ask here on the forum and our experts will try and help you out as soon as possible.


  • 0
What are you looking for?