Please help me.
This is 9th class-probability lesson.
Answers
for 4
p of not winning is 1 minus p of winning
so p of not winning is 1 minus 0.72
p of not winning is 0.28
for 5
I don't know the answer
in ATTACHMENT
the answer you gave me was wrong
there 8 In cm is converted m
so it is divided by 100
Step-by-step explanation:
Solutions :-
4)
Given that:-
Probability of a player winning a particular tennis match = 0.72
Let the winning match be an event E
So ,P(E)=72
Then , The losing match be an event :not E
Probability of the player loosing the match is
P( not E)
we know that
Sum of all probabilities of an event is always equal to 1
P(E)+P( not E)=1
=>0.72+ P(not E) = 1
=>P(not E)=1-0.72
=>P(not E) = 0.28
Probability of the player loosing the match = 0.28
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5)
Total number of families are surveyed = 1500
Total number of possible outcomes = 1500
Number of part time maids = 860
Number of favourable outcomes to part time maids = 860
Number of only full time maids = 370
Number of favourable outcomes to only full time maids = 370
Number of both type of maids = 250
Number of favourable outcomes to both type of maids = 250
From all families selecting a family randomly is an event then
We know that
Probability of an event =
Number of favourable outcomes/Total number of possible outcomes
1) Probability of getting both type of maids
=>250/1500
=>25/150
=>1/6
Probability of a family has both type of maids= 1/6
2) Probability of getting Part time maids
= 860/1500
=>86/150
=>43/125
Probability of getting Part time maids = 43/125
3)Number of part time maids =n(P only )=860
Number of only full time maids =n(F only) = 370
Number of both type of maids = n(PnF)= 250
Total number of families are surveyed= n(PUF)
= 1500
number of no maids =
n(PUF)= n(only P)+n(only F)+n(PnF)
= 1500-(860+370+250)
=>1500-(1480)
=>20
Number of no maids = 20
Probability of getting no maid = 20/1500
=>2/150
=>1/125
Probability of getting no maid = 1/125
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