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2 years ago

Please help ! Easy 7th grade work .

Mathematics

2 answers:

joja [24]2 years ago

7 0

Answer:

1. -38

2. -25

3. 10

4. -4

5. 0

6. -34

7. 9

8. -7

9. -4

Step-by-step explanation:

1. -22+(-16): All is needed to be done is adding it like normally but jsut by putting a negative sign in the front: -38

2. Same idea just add

3. Regular addition

4. This one is just positive 21 + (-21)= 0 with -4 left over

5. Add -17 and -3 together for -20 then add the positive 20 to get zero

6. Add positive 25 and negitve 25. You have -34 left over.

7. Add 5+4 to get 9

8. Since -15 is bigger then 8 it becomes negative

9. -11 is bigger so subtract 7 to get 4 but it becomes negative

Tpy6a [65]2 years ago

5 0

Answer:

1-9 answers

Step-by-step explanation:

1=-38

2=-25

3=16

4=-4

5=0

6=-34

7=9

8=-7

9=-4

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2 years ago

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3 years ago

A survey of 76 commercial airline flights of under 2 hours resulted in a sample average late time for a flight of 2.55 minutes.

nika2105 [10]

Answer:

The best point of estimate for the true mean is:

$\hat \mu = \bar X = 2.55$

$2.55-1.96\frac{12}{\sqrt{76}}=-0.148$

$2.55+1.96\frac{12}{\sqrt{76}}=5.248$

Since the time can't be negative a good approximation for the confidence interval would be (0,5.248) minutes. The interval are tellling to us that at 95% of confidence the average late time is lower than 5.248 minutes.

Step-by-step explanation:

Information given

$\bar X=2.55$ represent the sample mean for the late time for a flight

$\mu$ population mean

$\sigma=12$ represent the population deviation

n=76 represent the sample size

Confidence interval

The best point of estimate for the true mean is:

$\hat \mu = \bar X = 2.55$

The confidence interval for the true mean is given by:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

The Confidence level given is 0.95 or 95%, th significance would be $\alpha=0.05$ and $\alpha/2 =0.025$ . If we look in the normal distribution a quantile that accumulates 0.025 of the area on each tail we got $z_{\alpha/2}=1.96$

Replacing we got:

$2.55-1.96\frac{12}{\sqrt{76}}=-0.148$

$2.55+1.96\frac{12}{\sqrt{76}}=5.248$

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2 years ago