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SOVA2 [1]
3 years ago
5

Need help on 2 plz I can't understand it

Mathematics
1 answer:
Sphinxa [80]3 years ago
4 0
-3 1/2 
-7/8(change) * 4(days)= -3 1/2 or -3.5
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Find the average of 8.4 7.5 12.9 and 10.6 also the method how to do it​
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Find the average :8.4+7.5+12.9+10.6 divided by four
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Read 2 more answers
Slader records show that the average life expectancy of a pair of shoes is 2.2 years with astandard deviation of 1.7 years. A ma
Oksanka [162]

Answer:

For every 1000 pairs sold, the manufacturer expect to replace 239 pairs for free.

Step-by-step explanation:

Given:

Mean (μ) = 2.2, Standard deviation(S.D) (σ) = 1.7 years and x = 1 (1 year)

Let's find the Z score.

Z = \frac{x - mean}{S.D}

Now plug in the given values in the above formula, we get

Z = \frac{1 - 2.2}{1.7} = -0.71

Now we have to use the z-score table.

The z-score for 0.71 is 0.2611

Since it z is negative, so we subtract 0.2611 from 0.5000

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Percentage = 0.2389 × 100 = 23.89%

To find replaces for 1000 pairs, we need to multiply 23.89% by 1000

= \frac{23.89}{100} .1000 = 238.9

= 239

The cannot be in decimal, when we round off to the nearest whole, we get

239

3 0
3 years ago
Find the unit rate. Round to the nearest hundredth, if necessary. $130 for 17 ft2. The unit rate is $ /ft2.
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Answer:

201

Step-by-step explanation:

I'm smart ok trust me ON this one if I'M wrong at least I tried

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