Please help!! Will mark brainliest
1 answer:
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Answer:
a)
b)
c) Mary's score was 241.25.
Step-by-step explanation:
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.
In this problem, we have that:
a) Find the z-score of John who scored 190
b) Find the z-score of Bill who scored 270
c) If Mary had a score of 1.25, what was Mary’s score?
Mary's score was 241.25.
Answer: 3
Step-by-step explanation:
Since the denominator of the two fractions are already the same, we do not have to alter the fractions at all
Because the denominators are the same, all we have to worry about is the numerator, so take 67 and subtract 43 from it to get 24
As you know, 24/8 = 3, and that would be your final answer