Data Interpretation: Given a Distribution for 400 populations like this.
Thousand Dollars--------Persons
00--9.9-------------------------25
10--19.9-----------------------50
20--29.9-----------------------75
30--39.9-----------------------40
40--49.9-----------------------20
50--59.9-----------------------60
60--69.9-----------------------20
70--79.9-----------------------60
80--89.9-----------------------20
90--99.9-----------------------20
I) If 3 persons are chosen randomly from 400 people, then what is the approximate probability that all 3 of them earn more than 70 thousand dollars?
II) If the percentile ranking is ranked as highest amount gets highest percentile, then which one of the following value could be of 85 percentile?
a) 30 thousand $
b) 75 thousand $
c) 67 thousand $
d) 85 thousand $
e) 58 thousand $
my exam on tomorrow PLZ PLZ solve this quickly, Advance thanks for solving.....
PLZ....