Write a unit rate for the situation. Show work

1 answer:

6 0

7. 50 words per minute
250 ÷ 5 = 50

8. $0.33 for every 1 banana
1.98 ÷ 6 = 0.33

9. 5 meters per second
20 ÷ 4 = 5

10. 20 miles for every 1 gallon
400 ÷ 20 = 20

Hope this helps! If you have any questions feel free to ask :)

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The mean life of a particular brand of light bulb is 1200 hours. if you know that at about 95% of this brand of bulbs will last

Snowcat [4.5K]

204
First, lookup a standard normal table and see what the z-score is for 0.025 (one half of 100% - 95%) to allow for equal sized tails. You should find that the z-score is 1.96. That means that 95% of the time, the value should be within 1.96 standard deviations of the mean. Now let's calculate the standard deviation. 800 is 800 - 1200 = -400 to the left of the mean of 1200. 1600 is 1600 - 1200 = 400 to the right of the mean of 1200. So we are an equal distance of 400 on both sides of the mean. And we know from the z-score of 1.96, that we're 1.96 standard deviations from the mean. So a little division will give us the standard deviation. Which is: 400 / 1.96 = 204.0816327
So the standard deviation of the light bulbs is 204

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2 years ago

The mean percent of childhood asthma prevalence in 43 cities is 2.16%. A random sample of 31 of these cities is selected. What i

IceJOKER [234]

Probability that the mean childhood asthma prevalence for the sample is greater than 2.6% is 0.0357 or 3.57 %.

What is Probability ?

Probability is the measure of likelihood of an event.

For a Normal Distribution ,

the z-score formula is given by

$\rm Z = \dfrac{X - \mu }{\sigma}$