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Mathematics

2 answers:

Mariana [72]3 years ago

7 0

I think the answer might be $9

Blababa [14]3 years ago

4 0

Answer: it will cost abt $13 to make 50 cups but the best one bellow would be $9

Step-by-step explanation:

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How to model the problem

Ilia_Sergeevich [38]

Change 5/3 to 15/9. Then add 15 + 17 and put it over 9. 32/9

7 0

3 years ago

What is the answer for this problem

Tasya [4]

Answer: Y= -3/7+5

Step-by-step explanation:

4 0

2 years ago

One-third of a number t is less than or equal to 5

Kryger [21]

Answer:

t ≤ 15

Step-by-step explanation:

One third of 15 is equal to five (1/3 × 15 = 5)

One third of t is lesser than or equal to five (1/3 × 5 ≤ 5)

So, t cannot be more than 15. It can be equal to 15, though.

∴t ≤ 15

7 0

3 years ago

Of 1000 randomly selected cases of lung cancer, 823 resulted in death within 10 years.

Arada [10]

Answer:

a) $0.823 - 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.799$

$0.823 + 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.847$

The 95% confidence interval would be given by (0.799;0.847)

b) $n=\frac{0.823(1-0.823)}{(\frac{0.03}{1.96})^2}=621.79$

And rounded up we have that n=622

c) $n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

Step-by-step explanation:

Part a

$\hat p=\frac{823}{1000}=0.823$

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by: