Juanita wants to buy 254.7 pounds of mulch for her garden. The mulch usually costs $6.99 for 50 pounds. Juanita found a sale tha
2 answers:
Answer:
Savings = -
dollars.
Step-by-step explanation:
We are given that,
Juanita usually buys 50 pounds of mulch for $6.99.
That is, total cost of 254.7 pounds of mulch = dollars.
Now, since there is sale on the price of the mulch, we have,
Price of 50 pounds of mulch on sale = $5.99
Then, price of 254.7 pounds of mulch on sale = dollars.
Thus, the savings Juanita had = Original price of 254.7 pounds of mulch - Price of 254.7 pounds of mulch on sale.
Hence, savings = -
dollars.
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Answer:
The bulbs should be replaced each 1436.9 hours.
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:
How often should the bulbs be replaced so that no more than 1% burn out between replacement periods?
This is the first percentile of hours. So it is X when Z has a pvalue of 0.01.
So it is X when Z = -2.33.
The bulbs should be replaced each 1436.9 hours.
Answer:
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Step-by-step explanation:
see the attached figure to better understand the problem
we know that
A cube has six square faces
The surface area of a cube is equal to the area of the six squares faces
where
b is the length side of a cube
In this problem we have
substitute
