A + s = 279
s = 2a
a + 2a = 279
3a = 279
a = 279/3
a = 93 <=== adult
s = 2a
s = 2(93)
s = 186 ....students
Answer:
(x - 5)² + (y + 7)² = 81
Step-by-step explanation:
The equation of a circle in standard form is
(x - h)² + (y - k)² = r²
where (h, k) are the coordinates of the centre and r is the radius
Here (h, k) = (5, - 7) and r = 9, thus
(x - 5)² + (y - (- 7))² = 9², that is
(x - 5)² + (y + 7)² = 81 ← equation of circle
Answer:
Using the probability mass function we got:
And adding the probabilities we got:
Step-by-step explanation:
Previous concepts
The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".
Let X the random variable of interest, on this case we now that:
The probability mass function for the Binomial distribution is given as:
Where (nCx) means combinatory and it's given by this formula:
Solution to the problem
For a fair coin flip n=28 times we have the following distribution:
We want to find this probability:
Using the probability mass function we got:
And adding the probabilities we got:
Answer:
9
Step-by-step explanation:
15(8-2)
15-(6)
9
The price of tablet was $250 before mark down.
Step-by-step explanation:
Given,
Mark down = 15%
Price after mark down = $212.50
As price is marked down 15% from 100%, we can say that
(100-15)% = 85% is the price after markdown.
Let,
x be the original price.
Therefore,
85% of x = 212.50
Dividing both sides by 0.85
The price of tablet was $250 before mark down.
Keywords: percentage, division
Learn more about percentages at:
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