I need help fast ASAP will give brainiest

Mathematics

1 answer:

Leokris [45]2 years ago

6 0

Answer:

255.13 or 255.125

Step-by-step explanation:

2.5 times 3.14 equals 7.85

7.85 times 32.5

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Thoes are two separate questions number 10 and 11. Please help

DerKrebs [107]

19374892837372737373

7 0

2 years ago

60 is x% of 12. Find the value of x.

Liula [17]

Answer:

Step-by-step explanation:

We can set up a percentage proportion to find the value of x.

$\frac{12}{x} = \frac{60}{100}$

Now we cross multiply:

$100\cdot12=1200\\\\1200\div60=20$

Hope this helped!

4 0

3 years ago

For a standardized psychology examination intended for psychology majors, the historical data show that scores have a mean of 50

Volgvan

Answer:

$P(\bar X>530)=1-0.808=0.192$

Step-by-step explanation:

1) Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Let X the random variable that represent the scores, and for this case we know the distribution for X is given by:

$X \sim N(\mu=505,\sigma=170)$