Match the solution to its expression.
1 answer:
Answers are: choice #2 (3/7)
and choice #1 (2/3)
Step by step, see also the attachment
When adding or subtracting fractions, we know the denominator (bottom number) has to be the same and then we either add or subtract the numerator (top number). The bottom number is how many parts there is in a whole, like a pie.
5/7 - 2/7
5-2 = 3
Answer is 3/7
1/3 + 1/3
1 + 1 = 2
Answer is 2/3
and choice #1 (2/3)
Step by step, see also the attachment
When adding or subtracting fractions, we know the denominator (bottom number) has to be the same and then we either add or subtract the numerator (top number). The bottom number is how many parts there is in a whole, like a pie.
5/7 - 2/7
5-2 = 3
Answer is 3/7
1/3 + 1/3
1 + 1 = 2
Answer is 2/3
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Answer:
You would need to go 1.6 standard errors away from 0.09.
Step-by-step explanation:
We can solve this using the normal distribution, because, by the Central Limit Theorem, the sampling distribution of the sample proportions is approximately normal.
Problems of normally distributed samples are 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.
89% of the sample proportions.
50 - 89/2 = 5.5th percentile
50 + 89/2 = 94.5th percentile
5.5th percentile
X when Z has a pvalue of 0.055. So X when Z = -1.6.
So 1.6 standard error away from 0.09.
94.5th percentile
X when Z has a pvalue of 0.945. So X when Z = 1.6.
So 1.6 standard error away from 0.09.
You would need to go 1.6 standard errors away from 0.09.