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Flauer [41]
3 years ago
12

What is the solution to the equation below? Round your answer to two decimal places. 7x = 77

Mathematics
2 answers:
Vladimir79 [104]3 years ago
6 0
Divide both sides by 7
x=11
Tatiana [17]3 years ago
5 0

Answer:

value of x = 11.00

Step-by-step explanation:

here's the solution ; -

given equation :

=》

7x = 77

dividing both sides by 7

=》

\frac{7x}{7}  =  \frac{77}{7}

=》

x = 11

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2 years ago
The authors of a paper concluded that more boys than girls listen to music at high volumes. This conclusion was based on data fr
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Answer:

Since the calculated value of z= 2.82  does not lie in the critical region  the null hypothesis is accepted and it is concluded that the sample data support the authors' conclusion that the proportion of the country's boys who listen to music at high volume is greater than this proportion for the country's girls.

The value of p is 0 .00233. The result is significant at p < 0.10.

Step-by-step explanation:

1) Let the null and alternate hypothesis be

H0:  μboys − μgirls > 0

against the claim

Ha: μboys − μgirls ≤ 0

2) The significance level is set at 0.01

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4) The test statistic

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Here p1= 397/768= 0.5169  and p2= 331/745=0.4429

pc = 397+331/768+745

pc= 0.4811

qc= 1-pc= 1-0.4811=0.5188

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Z= p1-p2/ sqrt [pcqc( 1/n1+ 1/n2)]

z= 0.5169-0.4429/√ 0.4811*0.5188( 1/768+  1/745)

z= 2.82

6) Conclusion

Since the calculated value of z= 2.82  does not lie in the critical region  the null hypothesis is accepted and it is concluded that the sample data support the authors' conclusion that the proportion of the country's boys who listen to music at high volume is greater than this proportion for the country's girls.

7)

The value of p is 0 .00233. The result is significant at p < 0.10.

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