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1
A random survey of numbers of children of various age group playing in a park was found as follows. Children playing under the age of 10 years are:
53
35
23
32
2
The record of a weather station shows that out of the past 300 days, its weather forecasts were correct 170 times. What is the probability that on a given day it was correct ?
3
A random survey of numbers of children of various age group playing in a park was found as follows. Children playing between the age group of 3-5 years are:
5
9
6
7
4
In a box, there are 7 blue pens and 4 red pens. Ankit picks up a pen without looking at it. The probability that it is a red pen is
4/11
7/11
4/7
11/4
Tally marks are used to find which of the following?
Frequency
Range
Median
Mode
20 years ago, when my parents got married, their average age was 23 years, now the average of my family, consisting of myself and my parents only is 35 years. My present age is
17 years
14 years
12 years
16 years
If nPr = 360 , find r.
8
If acoin is tossed, what is the total number of possible outcomes?
0
Shubhi drawn a card from a well - shuffled pack of cards . the probability that she gets either a face card or an ace , is
3/13
3/169
4/13
5/13
10
A coin is tossed, find the probability of not getting an head.
0.5
0.2
11
In a city, the weekly observations on the cost of living index made in a study are given in the following table :
What is the class mark of interval 158 - 168 ?
158
164
168
163
12
To find the mode of a grouped data, the size of the classes is ________________.
Uniform
Non- uniform
Proportional
None of these
13
2 coins are tossed simultaneously find the probabilty of getting atleast 1 tail.
3/4
4/3
1/2
14
If P( n, 5) = 20. P(n-3) , find n.
16
15
A card is drawn from a well shuffled pack of 52 cards. Find the probability of: a card of diamond
A random survey of numbers of children of various age group playing in a park was found as follows. Children playing under the age of 17 years are:
55
48
49
44
17
While computing the mean of grouped data, we assume that the frequencies are ________________________.
Evenly distributed over all the classes
Centered at the class marks of the classes
Centered at the upper limits of the classes
Centered at the lower limit of the classes
18
Which of following statements are true for secondary data
1. When an investigator collects data by using a proper form and with a definite plan.
2. Data are reliable and relevant because they are original in character.
3. Data are collected by some individuals or by some institutions or by research bodies.
Only 1 and 2
Only 2 and 3
Only 1 and 3
19
A card is drawn from a well shuffled pack of 52 cards. Find the probability of: a black face card:
20
A card is drawn from a well shuffled pack of 52 cards. Find the probability of: a jack
21
A card is drawn from a pack of well - shuffled card, what is the probability of it being a black faced card ?
2/13
3/26
6/26
22
Which of the following statement is true regarding range of data:
1. It tells us how widely the numbers are spread.
2. It is the difference of the highest and the lowest observation.
3. It is the average number of observations.
1, 2 and 3
Probability that a leap year selected at random will contain 53 Sundays is ________________ .
24
If odds in favor of X Solving a problem are 5 to 6. Find the number of unfavorable outcomes in the experiment.
25
Which of the following statement is/are correct?
(a) In a box there are 14 black balls, 10 yellow balls and 5 white balls. The number of outcome for selecting one of these balls is 29
(b) In library there are 12 Moral Science books, 5 General Science books. The number of ways in which a student can pick one of these books in 17 ways.
Both (a) and (b) are correct.
Only (a) is correct.
Only (b) is correct.
None of these.
26
Which one of the following is not correct:
1. Statistics is liable to be misused.
2. The data collected by the investigator is known as raw data.
3. Statistical results are accurate.
4. Statistical data takes individual data into account.
Only 1
Only 2 and 4
Only 3 and 4
27
The arithmetic mean for the following frequency distribution is_________________.
CLASS INTERVAL
FREQUENCY1
14.5
28.3
28
Find the total number of ways of answering five objective type questions each question having four choices.
625 ways.
1024 ways.
256 ways.
3125 ways.
29
Over the past 200 working days, the number of defective parts produced by a machine is given in the following table:
Determine the probability that tomorrows output will have:at most one defective part.
30