All categories

2 years ago

THIS IS SO CONFUSING! I hate this

Mathematics

1 answer:

djyliett [7]2 years ago

3 0

Answer:

2 and 6 for the circles.

-18 for the square.

Step-by-step explanation:

-3 times a number is -6.

$-3 \times 2 = -6$

The number is 2.

2 times a number is 12.

$2 \times 6 = 12$

The number is 6.

6 times -3.

$6 \times -3 = -18$

The number is -18.

You might be interested in

PLEASE HELP ASAP<br> Evaluate bd/a +c if a=−2 , b=3 , c=−12 , and d=−4 .

Diano4ka-milaya [45]

Answer:

$\frac{bd}{(a + c)} = \frac{3 \times ( - 4)}{ (- 2) + ( - 12)} = \frac{( - 12)}{( - 14)} = \frac{6}{7} \\$

<h3>6/7 is the right answer.</h3>

3 0

3 years ago

An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and

egoroff_w [7]

Answer:

a) $P(140$

$P(0.036$

b) $P(140< \bar X$

Step-by-step explanation:

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".

Part a

Let X the random variable that represent the weights of a population, and for this case we know the distribution for X is given by:

$X \sim N(139,28.1)$

Where $\mu=139$ and $\sigma=28.1$

We are interested on this probability

$P(140$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

$z=\frac{x-\mu}{\sigma}$

If we apply this formula to our probability we got this:

$P(140$

And we can find this probability like this:

$P(0.036$

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.

$P(0.036$

Part b

For this case we select a sample size of n =32. Since the distribution for X is normal then the distribution for the sample mean $\bar X$ is given by: