Solve this quadratic equation using the quadratic formula x^2 + 8x - 5 = 0
1 answer:
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Answer:
12 years.
Step-by-step explanation:
We are asked to find the time it will take to an amount of $1000 to grow to $2000 at a rate of 6% per year.
To find the number of years it will take the amount to double, we will divide 72 by growth rate that is 6% is this case.
Therefore, it will take 12 years for a $1,000 investment to grow to $2,000, assuming the investment grows at 6% per year.
Answer:
And the best way to solve this problem is using the normal standard distribution and the z score given by:
If we apply this formula to our probability we got this:
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the weights of a population, and for this case we know the distribution for X is given by:
Where and
We are interested on this probability
And the best way to solve this problem is using the normal standard distribution and the z score given by:
If we apply this formula to our probability we got this: