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klasskru [66]
3 years ago
15

Solve : -2 1/3 - (-5) =?

Mathematics
1 answer:
Debora [2.8K]3 years ago
7 0

Answer:

2 2/3

Step-by-step explanation:

-2 1/3-(-5)

-2 1/3+5

5-2 1/3

2 2/3

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Stress at work: In a poll conducted by the General Social Survey, 80% of respondents said that their jobs were sometimes or alwa
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Answer:

a) P=0.019

b) P=0.263

c) P=0.794

Step-by-step explanation:

We assume that the poll gives the population's proportion of respondents said that their jobs were sometimes or always stressful (p=0.8).

Then, a sample of size n=190 is taken.

The sample mean is:

\mu=np=190*0.8=152

The sample standard deviation is:

\sigma=\sqrt{np(1-p)}=\sqrt{190*0.8*0.2}=\sqrt{30.4}=5.514

The probability that 140 or fewer workers find their jobs stressful is:

z=(X-\mu)/\sigma=(140.5-152)/5.514=-11.5/5.514=-2.08 \\\\P(X\leq140)=P(X

Note: a correction for continuity is applied.

The probability that more than 155 workers find their jobs stressful is

z=(X-\mu)/\sigma=(155.5-152)/5.514=3.5/5.514= 0.635 \\\\P(X>155)=P(X>155.5)=P(z>0.635)=0.263

The probability that the number of workers who find their jobs stressful is between 145 and 158 inclusive is:

z_1=(X_1-\mu)/\sigma=(158.5-152)/5.514=6.5/5.514= 1.179\\\\  z_2=(X_2-\mu)/\sigma=(144.5-152)/5.514=-7.5/5.514= -1.360 \\\\ P(145\leq X\leq 158)=P(144.5< X< 158.5)\\\\P(145\leq X\leq 158)=P(X

5 0
3 years ago
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chubhunter [2.5K]

Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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Miles ordered 126 = rounded : 130
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Answer:

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Step-by-step explanation:

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