If is Tim's age, then
, so
.
If is Amy's age, then
, so her age is also
.
Question 5: What is the solution of the system of equations? .A .B .C .D
2 answers:
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9514 1404 393
Answer:
6.64
Step-by-step explanation:
Perhaps you have ...
_____
Here, it is convenient to factor out 10^-19. If you like, a calculator or spreadsheet can figure this for you.
Answer:
62.17% probability that a randomly selected exam will require more than 15 minutes to grade
Step-by-step explanation:
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.
In this problem, we have that:
What is the probability that a randomly selected exam will require more than 15 minutes to grade
This is 1 subtracted by the pvalue of Z when X = 15. So
has a pvalue of 0.3783.
1 - 0.3783 = 0.6217
62.17% probability that a randomly selected exam will require more than 15 minutes to grade