Look at it this way:
When you flip a coin, the probability of it landing with EITHER side showing
is 100%.
This leads us to the rule ...
The sum of the probabilities of
all possible outcomes is 100%.
For a coin: (probability of heads) plus (probability of tails) = 100%.
That just says: We're 100% sure that the coin will land with either
heads or tails up.
An "honest" coin gets heads 50% of the time and tails the other 50%.
But if the coin is all bent and squashed and has a feather stuck to
one side and a wad of gum on the other side so that it comes up
heads 70% of the time, then the coin isn't 'honest'. But it still has to
land EITHER heads OR tails, so the sum of the probabilities is still 100%.
So the probability of heads is 30%.
Answer:
Y= 2.54
Step-by-step explanation:
Given proportion is:
y : 11 :: 3 : 13
13 y = 11 *3
y= 33/13
y = 2.538
or
y= 2.54
90 divided by 40 and the equals 2.25 so it would be 2.25%
Yes , because 2-2 equals 0 then 0+5x leaving just 5x as the answer