B.Sc. I (Biotechnology) (Semester (CBCS) Examination, 2018
Cel Biology and biostatistics
Paper II Biostatistics
Day and Date Monday, 9-4-2018 Max. Marks 70
Time 10.30 a.m. to 1.00 p.m.
Instructions All questions are compulsory.
Figures to the right indicate full marks.
Use of basic calculator is allowed.
Use graph paper wherever necessary.
1. Rewrite the following sentences by using correct alternative 14
Example of continuous variable is
Weight of a book Number of words in the paragraph
Number of pages in the book Number of books in the library
In a table the headings of the column are called
Stubs Captions Titles Source Note
If the sum of observations is 525 and their mean 25, then the value of
n is
21 25 52.5 5.25
Shirt size of the most of the people in India is No. 40. Which measure of
central value does it represent
Mean Median Mode Average
Relative frequency of the variable is always
in percentage a fraction
an integer an irrational number
Following is an example of qualitative data
Height of a house Colour of a bike
Shirt size Time to finish the race
If X Largest and Y Smallest value in the data then the coefficient of range is

X/Y
If the unit of observations is cm the unit of variance of these observations is
cm m cm2 no unit
Which of the following is a possible value of the correlation coefficient
1.2 0.9 1.01 -1.01
10) Let A be event of rolling a die. Let B be event of an even number between
5 to then A B is

11) If A and B are two events, the probability of occurrence of both A and B is
given as
P(A P(A
12) A sample is of population.
Super set Power set Sub set Complement
13) The sum of the probabilities of all sample events in the sample space must
be equal to
0 1 0.5
14) If the frequency distribution has classes, 30-31, 32-33, 34-35, then lower
class boundary of the class 32-33 is
32 32.5 31.5 31
2. Attempt any five of the following 14
Define 'Class width' and give an example.
State merits of
The marks obtained by 10 students are 58, 70, 67, 49, 73, 64, 57 66, 71, 75.
Calculate the mean marks.
Compute the coefficient of range for data 42, 55, 79, 16, 55, 69, 13, 26, 95.
If byx 0.2 and the correlation coefficient r 0.6, then find bxy.
What is the probability of getting "a perfect square number" in single throw
with die
If 0.3, 0.4 and P(A 0.5, find P(AB).
If standard deviation of 10 observations is 4.7, find standard error.
For the data, if standard deviation is 3 and mean is 14 then find the coefficient
of variation.
3. Attempt any two of the following 10
Calculate mode marks from the following data
Marks 10-20 20-30 30-40 40-50 50-60 60-70
No. of students 5 16 32 13 10 4
Write five important applications of Biostatistics in detail.
A single card is drawn from a pack of 50 cards, numbered from 1 to 50.
Find the probability that it is a multiple of 5 or a multiple of 6.
Solve the following 4
Population of birds on 100 trees are as follows
No. of birds 0-10 10-20 20-30 30-40 40-50 50-60
No. of trees 9 21 27 18 19 6
Draw a Histogram.
4. Attempt any two of the following 14
Draw less than and more than Ogive for the following data
X 10-20 20-30 30-40 40-50 50-60 60-70 70-80
F 8 10 17 15 11 5 4
Find the coefficient of correlation from the following data
X 4 5 6 7 8 9 10
Y 6 7 8 9 10 11 12
Find the standard deviation from the following data
Class 4 6 7 8 9 10 11
Frequency 3 6 9 12 8 5 4
5. Attempt any two of the following 14
Find the regression equation X on Y from the following data
X 5 3 7 4 8 2 10 6 8 7
Y 8 6 8 5 9 6 8 5 11 7
A coin is tossed 50 times of which head comes 32 times. Use Chi-square
test to test the hypothesis that the coin is normal, having no bias for either
head or tail (Table value 3.84).
Find the mean deviation about mean of the following series
Class 0-5 5-10 10-15 15-20 20-25
Frequency 4 6 20 7 3