Mia bought a poster that was discounted $5 from an original price of $20. which equation models how mia can find the percent of
2 answers:
Answer:
discount percent = 25%
Step-by-step explanation:
Mia bought a poster that was discounted $5 from an original price of $20
Original price is $20
Discount amount is $5
Let x be the percentage of discount
Discount % is x%
original price times discount percentage is equal to discount amount
multiply both times by 100
Divide both sides by 20
x= 25%
So discount percent = 25%
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Step-by-step explanation:
In statistics, the empirical rule states that for a normally distributed random variable,
- 68.27% of the data lies within one standard deviation of the mean.
- 95.45% of the data lies within two standard deviations of the mean.
- 99.73% of the data lies within three standard deviations of the mean.
In mathematical notation, as shown in the figure below (for a standard normal distribution), the empirical rule is described as
where the symbol (the uppercase greek alphabet phi) is the cumulative density function of the normal distribution,
is the mean and
is the standard deviation of the normal distribution defined as
.
According to the empirical rule stated above, the interval that contains the prices of 99.7% of college textbooks for a normal distribution ,
Therefore, the price of 99.7% of college textbooks falls inclusively between $77 and $149.
