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Probability of Rain on a Day=0.2
What is the probability of raining atleast 2 days in a week ?
 11 months ago
 11 months ago
Probability of Rain on a Day=0.2 What is the probability of raining atleast 2 days in a week ?
 11 months ago
 11 months ago

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amistre64Best ResponseYou've already chosen the best response.2
there are 2 ways to approach this
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
out of 7 days in a week, it would be easier to calculate the compliment statement of: P(rain at most 1 day out of 7)
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
... or is the compliment; does not rain at most 1 day out of the week?
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
P(0) + P(1) at most 1 day of rain P(2) + P(3) + P(4) + P(5) + P(6) + P(7) at least 2 days of rain in any case .... the long way is: \[\sum_{2}^{7}~\binom{7}{r}~.2^r~.8^{7r}\]
 11 months ago

SyamantakBest ResponseYou've already chosen the best response.0
@amistre64 how do we solve the equation ?
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
im thinking the 1  P0+P1 is quicker "by hand"\[1\binom{7}{0}~.2^0.8^7\binom{7}{1}~.2^1.8^6\]
 11 months ago

SyamantakBest ResponseYou've already chosen the best response.0
Actually I don't know summation and other things could you give it to me in a simple version @amistre64
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
the (7 0) is just another way to write 7 "choose" 0, by this time you should have already gone thru the permuatation and combination material 7 C 0 is a common notation, but some texts use C(7,0) does any of that look familiar?
 11 months ago

SyamantakBest ResponseYou've already chosen the best response.0
No,nothing looks familiar to me.Could you write the equation in a multiplication/addition/division/subtraction format @amistre64
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
I already did. But if you do not know how to determine the number of ways to choose 0 from a set of 7, or the number of ways to choose 1 from a set of 7; then you really need to go back and review that material. The rest of the setup is elementary ....
 11 months ago

SyamantakBest ResponseYou've already chosen the best response.0
Can you solve the equation step by step @amistre64
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
not without having to try to teach you a chapters worth of material first. consider this tho: if you have 7 things in front of you, what is the number of ways you can simply walk away and choose none of them?
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
:) there is really only 1 way to choose none of them, the choice to walk away is only 1 option. 7 "choose" 0 is equal to 1; in fact anything "choose" 0 = 1
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
how, consider these 7 things, but you can only choose one of them; how many ways is there to choose 1 of them?
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
lets have 7 things to choose from: a b c d e f g we can choose a or we can choose b or we can choose c or we can choose d or we can choose e or we can choose f or we can choose g 7 "choose" 1 is equal to ..7 do you agree?
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
oh, you do agree :) good.
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
now we can do the elementary stuff \[ 1  (1~.2^0~.8^7+7~.2^1~.8^6)\]
 11 months ago

SyamantakBest ResponseYou've already chosen the best response.0
Ok so what will it be ?
 11 months ago

amistre64Best ResponseYou've already chosen the best response.2
most likely it will be whatever the calculator generates as an answer for you after you punch in the correct keys :/
 11 months ago
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