IITJEE/ AIPMT
Engineer Your Education to Success with a Group Exclusive of
NITIANS
D8 KOELNAGAR, D71 KOELNAGAR, L46 BASANTI COLONY
MATHEMATICS
:
TOPIC
 PROBABILITY
TIME: 1:30 HRS
CLASS IX
MAX MARKS:50
(Note
: 1.Solve each of the questions and answer them up to 1 places of decimal.
2. Numbers shown in right side of question indicates the marks allotted.)
Q1. A coin is tossed 1000 times with frequencies of Head: 455 and Tail: 545 find the probability for each event.
[2]
Q2. In a cricket match a batsman hits a boundary 6 times out of 30 balls she plays. Find the probability that she did
not hit a boundary.
[1]
Q3. The record of a weather station shows that out of past 250 consecutive days, its weather forecasts were correct
175 times. Then fine the probability such that:
[4]
A)
On a given day it was correct.
B)
It was not correct on a given day.
Q4. Eleven bags of wheat flour, each marked 5kg, actually contained the following weights of flour:
[3]
4.97
5.05
5.08
5.03
5.00
5.06
5.08
4.98
5.04
5.07
5.00
Find the probability that any of these bags chosen at random contains
A)
More than 5 kg.
B) Less than 5 kg.
C) Less than or equal to 5 kg.
Q5. Two coins are tossed simultaneously 500 times, and we get
[4]
Two heads: 105 times
One head: 275 times
No head: 120 times
Find the probability of occurance of each of these events
Find the probability of occurance of head at most 2 times
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 Summer '14
 JUDE
 Management

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