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Svetlanka [38]
3 years ago
14

Question 5: -4/7 x (-3/10) = ? A: 7/70 B: -12/70 C: 7/17 D: 12/70

Mathematics
1 answer:
kupik [55]3 years ago
7 0
Answer is D because you can't simplify 12/70.

(At least... not on the answers)
You might be interested in
The average yield of the standard variety off soybeans per acre on a farm in a region is 48.8 bushels per acre, with a standard
I am Lyosha [343]

Answer:

z=\frac{53.4-48.8}{\frac{12}{\sqrt{36}}}=2.3  

p_v =P(Z>2.3)=1-P(Z  

If we compare the p value and the significance level given \alpha=0.01 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, so we can conclude that the true mean is not significantly higher than 48.8 at 1% of signficance.  

Step-by-step explanation:

1) Data given and notation  

\bar X=53.4 represent the sample mean

\sigma=12 represent the population standard deviation assumed

n=36 sample size  

\mu_o =48.8 represent the value that we want to test  

\alpha=0.01 represent the significance level for the hypothesis test.  

z would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

2) State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is higher than 48.8, the system of hypothesis would be:  

Null hypothesis:\mu \leq 48  

Alternative hypothesis:\mu > 48  

Since we assume that know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

3) Calculate the statistic  

We can replace in formula (1) the info given like this:  

z=\frac{53.4-48.8}{\frac{12}{\sqrt{36}}}=2.3  

4)P-value  

Since is a right tailed test the p value would be:  

p_v =P(Z>2.3)=1-P(Z  

5) Conclusion  

If we compare the p value and the significance level given \alpha=0.01 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, so we can conclude that the true mean is not significantly higher than 48.8 at 1% of signficance.  

3 0
3 years ago
Which is not equivalent to the rest 13/20 66% 195/300 0.6500
Ganezh [65]
Hey there! :)

Let's change all the fractions and percents to decimal.
_____________________________________________________________

When changing fractions to decimal, divide the numerator by the denominator
When changing percents to decimal, remove the % sign and move the decimal to places to the left.
_____________________________________________________________

13 ÷ 20 = 0.65
66% = 0.66
195 ÷ 300 = 0.65
0.6500 = 0.65
_____________________________________________________________

The answer is 66% because it is the only one that isn't equivalent to 0.65

Hope this helps :)
8 0
3 years ago
A team of 9 tennis players can order bags with their uniforms
jeka94

Answer:

C

Step-by-step explanation:

5 0
3 years ago
The total number of dollars you would have received if you received one dollar on your first birthday, two dollars on your secon
Tanzania [10]

Answer:

262,143

Step-by-step explanation:

  1. 1
  2. 1+2
  3. 3+4
  4. 7+8
  5. 15+16
  6. 31+32
  7. 63+64
  8. 127+128
  9. 255+256
  10. 511+512
  11. 1023+1024
  12. 2047+2048
  13. 4095+4096
  14. 8191+8192
  15. 16,383+16,384
  16. 32,767+32,768
  17. 65,535+65,536
  18. 131,071+131,072

        =262,143

6 0
3 years ago
Which fractions are equivalent to 2/8?
Hitman42 [59]

Answer:

1/4 and 3/12

Step-by-step explanation:


3 0
3 years ago
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