Advertisements
Advertisements
рдкреНрд░рд╢реНрди
Durations of sunshine (in hours) in Amritsar for first 10 days of August 1997 as reported by
the Meteorological Department are given below: 9.6, 5.2, 3.5, 1.5, 1.6, 2.4, 2.6, 8.4, 10.3, 10.9
(i) Find the mean ЁЭСЛ ╠Е
(ii) Verify that = `sum _ ( i = 1)^10`(xi - x ) = 0
рдЙрддреНрддрд░
Duration of sunshine (in hours) for 10 days are
= 9.6, 5.2, 3.5,1.5,1.6, 2.4, 2.6,8.4,10.3,10.9
(i) Mean x = `"Sum of all numbers "/"Total numbers"`
= `(9.6 + 5.2 + 3.5 +1.5 +1.6 + 2.4 + 2.6 + 8.4 +10.3 +10.9)/ 10`
` = 56 / 10 = 5.6`
(ii) LHS = `sum _(i = 1)^10`
= ( x1 - x ) + ( x2 - x ) + ( x3 - x ) + .............. + ( x10 - x )
= (9.6 - 5.6) + (5.2 - 5.6) + (3.5 - 5.6) + (1.5 - 5.6) + (1.6 - 5.6) + (2.4 - 5. 6)
= (4) + (-0.4) + (-2.1) - 4 .1- 4 - 3.2 - 3 + 2.8 + 4.7 + 5.3
= 16.8 - 16.8
= 0
APPEARS IN
рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНрди
Find the mean of x, x + 2, x + 4, x +6, x + 8.
Find the missing frequency (p) for the following distribution whose mean is 7.68.
| x | 3 | 5 | 7 | 9 | 11 | 13 |
| f | 6 | 8 | 15 | p | 8 | 4 |
Find the median of the following data (1-8)
83, 37, 70, 29, 45, 63, 41, 70, 34, 54
Find the median of the following data (1-8)
25, 34, 31, 23, 22, 26, 35, 29, 20, 32
If the mean of 2, 4, 6, 8, x, y is 5, then find the value of x + y.
The arithmetic mean and mode of a data are 24 and 12 respectively, then find the median of the data.
If the mean of five observations x, x+2, x+4, x+6, x+8, is 11, then the mean of first three observations is
The class marks of a frequency distribution are given as follows: 15, 20, 25, ... The class corresponding to the class mark 20 is ______.
A grouped frequency table with class intervals of equal sizes using 250 – 270 (270 not included in this interval) as one of the class interval is constructed for the following data:
268, 220, 368, 258, 242, 310, 272, 342, 310, 290, 300, 320, 319, 304, 402, 318, 406, 292, 354, 278, 210, 240, 330, 316, 406, 215, 258, 236.
The frequency of the class 310 – 330 is:
A football player scored the following number of goals in the 10 matches:
1, 3, 2, 5, 8, 6, 1, 4, 7, 9
Since the number of matches is 10 (an even number), therefore, the median
= `(5^("th") "observation" + 6^("th") "observation")/2`
= `(8 + 6)/2` = 7
Is it the correct answer and why?
