Page 287 - Data Science class 11
P. 287
Practical Questions
Interdisciplinary
1. Find the mean of the following data:
a. 9,7,11,13,2,4,5,5
Ans. Mean = Sum of the elements/number of elements
= (9+7+11+13+2+4+5+5)
8
= 7
b. 16,18,19,21,23,23,27,29,29,35
Ans. Mean = Sum of the elements/number of elements
(16+18+19+21+23+23+27+29+29+35)
=
10
= 24
c. 2.2.10.2,14.7,5.9,4.9,11.1,10.5
Ans. Mean = Sum of the elements/number of elements
(2.2+10.2+14.7+5.9+4.9+11.1+10.5)
=
7
=8.5
2. Find the mean of first ten whole numbers.
Ans. Mean = Sum of the elements/number of elements
(0+1+2+3+4+5+6+7+8+9)
=
10
=4.5
3. Find the mean of first 5 prime numbers.
Ans. (2+3+5+7+11)/5=5.6
4. The mean of 8,11,6,14,x,13 is 66. Find the value of x.
Ans. Mean=(Sum of numbers)/total number of values
66=(8+11+6+14+x+13)/6
66=52+x/6
66*6=52+x
x=396-52
x=344
5. Declare the following variables and find their datatypes using class() function using R Studio.
a. x<-10
Ans. class(x)
Output
[1] “numeric”
Practical Questions 285

