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3 years ago

What’s the percent decrease from 90 to 70 in sales

Mathematics

1 answer:

ira [324]3 years ago

3 0

Answer:

22%

Step-by-step explanation:

So First we subtract 90 and 70 = 20

Then we divide 20 by 90 = which gives us approximately 0.22 then we turn that into a percent by moving the decimal point 2x to the right.

So In conclusion, the percent decrease is 22%

Remember the formula is:

amount of change ÷ by the original amount

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Answer:

Step-by-step explanation:

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4 years ago

An advisor to the mayor of a large city wants to estimate, within 3 minutes, the mean travel time to work for all employees who

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Answer:

Step-by-step explanation:

Given that an advisor to the mayor of a large city wants to estimate, within 3 minutes, the mean travel time to work for all employees who work within the city limits.

Let X be the random variable denoting the time for employees to travel within city limit

Std dev of X $= 12.25 minutes$

For 95% confidence interval Z critical 1.96 is used because population std dev is known

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i.e. $1.96(\frac{12.25}{\sqrt{n} } )=3$

where n is the desired sample size.

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