Five binders and three folders cost $23. Five binders and one folder cost $20. How much does one binder cost?
2 answers:
Answer:
one binder for $3.70
Step-by-step explanation:
The cost of 5 binders and 3 folders = $23.00
The cost of 5 binders and 1 folder = $20.00 [ 2 folders less ]
Cost of 2 folders = 23 - 20 = $3.00
Cost of 1 folder = = $1.50
The cost of 5 binders = 20.00 - 1.50 = $18.50
The cost of 1 binder =
= $3.70
The cost of one binder is $3.70
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Answer:
Step-by-step explanation:
Z-score:
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 question:
You listen to the radio station for 1 hour, at a randomly selected time, and carefully observe that the amount of advertising time is equal to 17 minutes. Calculate the z-score for this amount of advertising time.
We have to find Z when X = 17. So