Let's translate the words into expressions:
11 less than 7 times a number is
5 more than 6 times the number is
So we have the equation
Subtract 6x from both sides:
Add 11 to both sides:
A is what percent of B?d)A = 8 oz, B = 1.5 lb Plz help need by today
1 answer:
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Answer:
Ratio = 5/3
The ratio (larger to smaller) of the perimeters is 5/3
Step-by-step explanation:
Attached is an image of the two triangles.
Since both triangles are similar, the ratio of their perimeter is equal to the ratio of each similar sides.
Ratio = P1/P2 = S1/S2
Similar side for triangle 1 S1 = 15ft
Similar side for triangle 2 S2 = 9ft
Substituting the values;
Ratio = 15ft/9ft = 5/3
Ratio = 5/3
The ratio (larger to smaller) of the perimeters is 5/3
Answer:
The approximate distribution of the number who carry this gene is approximately normal with mean and standard deviation
Step-by-step explanation:
For each person, there are only two possible outcomes. Either they carry the defective gene that causes inherited colon cancer, or they do not. The probability of a person carrying this gene is independent from other people. So the binomial probability distribution is used to solve this question.
A sample of 2500 individuals is quite large, so we use the binomial approximation to the normal to solve this question.
Binomial probability distribution
Probability of exactly x sucesses on n repeated trials, with p probability.
Can be approximated to a normal distribution, using the expected value and the standard deviation.
The expected value of the binomial distribution is:
The standard deviation of the binomial distribution is:
Normal probability distribution
Problems of normally distributed samples can be solved using the z-score formula.
In a set with mean and standard deviation
, the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
When we are approximating a binomial distribution to a normal one, we have that ,
.
An article reports that 1 in 500 people carry the defective gene that causes inherited colon cancer.
This means that
In a sample of 2500 individuals, what is the approximate distribution of the number who carry this gene?
So
So the approximate distribution of the number who carry this gene is approximately normal with mean and standard deviation