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evablogger [386]
2 years ago
10

Helppppp giving brainly too ​

Mathematics
2 answers:
maxonik [38]2 years ago
7 0

Step-by-step explanation:

{p}^{2}  + 2pq - 3 {q}^{2}

( \frac{1}{4}  {)}^{2}  + 2( \frac{1}{4} )( \frac{2}{3} ) - 3( \frac{2}{3}  {)}^{2}

\frac{1}{16}  +  \frac{1}{ 3}   -  \frac{4}{3}

\frac{ - 15}{16}

sweet [91]2 years ago
4 0
Alright. (1/4^2)+2((1/4)(2/3)-3(2/3^2)=-.9375 is the correct answer
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A survey of 225 students showed the mean number of hours spent studying per week was 20.6 and the standard deviations was 2.7
LekaFEV [45]

Answer:

The margin of error is approximately 0.3

Step-by-step explanation:

The following information has been provided;

The sample size, n =225 students

The sample mean number of hours spent studying per week = 20.6

The standard deviation = 2.7

The question requires us to determine the margin of error that would be associated with a 90% confidence level. In constructing confidence intervals of the population mean, the margin of error is defined as;

The product of the associated z-score and the standard error of the sample mean. The standard error of the sample mean is calculated as;

\frac{sigma}{\sqrt{n} }

where sigma is the standard deviation and n the sample size. The z-score associated with a 90% confidence level, from the given table, is 1.645.

The margin of error is thus;

1.645*\frac{2.7}{\sqrt{225}}=0.2961

Therefore, the margin of error is approximately 0.3

5 0
3 years ago
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When using statistics in a speech, you should usually Group of answer choices manipulate the statistics to make your point. cite
NARA [144]

Answer:

Avoid Using too many statistics

Step-by-step explanation:

when a speaker is giving a speech, the listeners prefer main points to hearing too much of statistics. Too many statistics bore the audience and sometimes divert their attentions from the crux of the speech. If statistics are to be given, they must be clearly expressed and the source should be clearly stated.

Numbers that are of large decimal points can be rounded off so as not to confuse the audience and to make them grasp the main idea.

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HELP I will mark branliest!!!!
Klio2033 [76]

Answer:

Rah&fyjftyhh

Step-by-step explanation:

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7 0
2 years ago
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Simplify this expression.<br> 3^-3
Sphinxa [80]

Answer:

1/27 is the answer

Step-by-step explanation:

It is 1/(3^3) which is 1/27

4 0
2 years ago
5 times the result of a number plus 7 equals 71 more than that number
lubasha [3.4K]
The answer is: 12.8
71 -7 = 64
64÷5=12.8
4 0
3 years ago
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