In what ratio does the points (2,-5) divide the line segment A(-3,5) and B(4,-9)
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Answer:
99.5% of all samples of 21 of today's women in their 20's have mean heights of at least 65.86 inches.
Step-by-step explanation:
We are given that a half-century ago, the mean height of women in a particular country in their 20's was 64.7 inches. Assume that the heights of today's women in their 20's are approximately normally distributed with a standard deviation of 2.07 inches.
Also, a samples of 21 of today's women in their 20's have been taken.
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<u><em>Let </em></u><u><em> = sample mean heights</em></u>
The z-score probability distribution for sample mean is given by;
Z = ~ N(0,1)
where, = population mean height of women = 64.7 inches
= standard deviation = 2.07 inches
The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) 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.
Now, Probability that the sample of 21 of today's women in their 20's have mean heights of at least 65.86 inches is given by = P(
65.86 inches)
P(
65.86 inches) = P(
) = P(Z
-2.57) = P(Z
2.57)
= <u>0.99492 or 99.5%</u>
<em>The above probability is calculated by looking at the value of x = 2.57 in the z table which has an area of 0.99492.</em>
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Therefore, 99.5% of all samples of 21 of today's women in their 20's have mean heights of at least 65.86 inches.
X = amount of the 18% solution
y = amount of the 40% solution
we know the 18% solution has only 18% of alcohol, the rest is maybe water or something, now, how many liters is 18%? well, 18% of anything is just (18/100) * anything, so, 18% of x is just (18/100) *x or 0.18x, and that's how many liters are there.
likewise, how many liters are there in the 40% solution? well, (40/100) * y, or 0.4y, that many.
we know the mixture has to yield 10 liters at 20% alcohol, how many liters of only alcohol is that? well, (20/100) * 10, or 2 liters.
how much of the 40% solution? well y = 10 - x
y = amount of the 40% solution
we know the 18% solution has only 18% of alcohol, the rest is maybe water or something, now, how many liters is 18%? well, 18% of anything is just (18/100) * anything, so, 18% of x is just (18/100) *x or 0.18x, and that's how many liters are there.
likewise, how many liters are there in the 40% solution? well, (40/100) * y, or 0.4y, that many.
we know the mixture has to yield 10 liters at 20% alcohol, how many liters of only alcohol is that? well, (20/100) * 10, or 2 liters.
how much of the 40% solution? well y = 10 - x