hi guys please help me out
10th std ch -14 statistics
Answers
ANSWER :
Statistic
You can Solve This Two problems by any method you like :
i) By the direct method.
- x ( top of the x put bar) = Σfixi / Σfi
ii) By the assumed mean method.
- x ( top of the x put bar) = a + Σfidi / Σfi
iii) By the step deviation method.
- x ( top of the x put bar) = a + { Σfiui / Σfi ) × h
Q8 ANS :
( FINDING THE MEAN NUMBER OF DAYS A STUDENT WAS
ABSENT )
No. of days No. of students ( fi ) xi fixi
0 - 6 11 3 33
6-10 10 8 80
10-14 7 12 84
14-20 4 17 68
20-28 4 24 96
28-38 3 33 99
38-40 1 39 39
TOTAL : Σfi = 40 Σfixi = 499
xi = upper limit + lower limit / 2
fixi = Given frequency × xi
- I Am solving this question by the direct method :
x ( top of the x put bar) = Σfixi / Σfi
= 499 / 40
Ans = 12.4.... approx days.
Q9 ANS :
{ FINDING MEAN LITERACY RATE ( IN PERCENT ) }
- This also i am gonna to solve this by direct method.
Literacy rate Number of cities xi fixi
45 - 55 3 50 150
55-65 10 60 600
65-75 11 70 770
75-85 8 80 640
85-95 3 90 270
TOTAL : Σfi = 35 Σfixi = 2430
xi = upper limit + lower limit / 2
fixi = Given frequency × xi
x ( top of the x put bar) = Σfixi / Σfi
= 2430 / 35
ANS : = 69.42... PERCENT approx
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