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Mice21 [21]
3 years ago
13

80% of what number is 15

Mathematics
1 answer:
joja [24]3 years ago
4 0
X time 0.8 (or 80 percent)= 15
so 15/0.8=X
18.75
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What is the y-intercept of the graph of 4y - 1= 3
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3 years ago
1. What would be the depth of water of 3/4 filled rectangular pool, if pool is 10 m long, 7 m wide and 8 m deep?
Vladimir79 [104]

Step-by-step explanation:

Area if the rectangular pool= 10m×7m×8m

= 560m³

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What is the value of Arc sine (StartFraction StartRoot 2 EndRoot Over 2 EndFraction)?
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3 years ago
A study investigated the effectiveness of meditation training in reducing trait anxiety. The study evaluated subjects trait anxi
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Answer:

The 99% confidence interval for the population mean reduction in anxiety was (1.2, 8.6).

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

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df = 27 - 1 = 26

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 26 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.99}{2} = 0.995. So we have T = 2.7787.

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M = T\frac{s}{\sqrt{n}} = 2.7787\frac{6.9}{\sqrt{27}} = 3.7

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The lower end of the interval is the sample mean subtracted by M. So it is 4.9 - 3.7 = 1.2.

The upper end of the interval is the sample mean added to M. So it is 4.9 + 3.7 = 8.6.

The 99% confidence interval for the population mean reduction in anxiety was (1.2, 8.6).

6 0
2 years ago
Anthony asked a group of students to choose their favorite type of music from the choices of rock, hip-hop, and country. The res
Fudgin [204]

Answer:

240

Step-by-step explanation:

add up the numbers of all the students that were surveyed

get 90

60 of those were rock or hiphop

divide 360 by 90

get 4

multiply 60 by 4

get 240

8 0
3 years ago
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