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3 years ago

All right Angels are?

Mathematics

2 answers:

MAXImum [283]3 years ago

5 0

All right Angels are 90 degrees

masha68 [24]3 years ago

3 0

Answer:

90 degrees

Step-by-step explanation:

All right angels add up to 90

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The CEO of a large company claims that 85% of customers are repeat customers. They define a repeat customer as someone who makes

Agata [3.3K]

Answer:

-1.58

0.0571

Got it right on edge:)

3 0

3 years ago

Tensile-strength tests were carried out on two different grades of wire rod. Grade 1 has 10 observations yielding a sample mean

earnstyle [38]

Answer:

$t=\frac{(1085 -1034)-(0)}{57.646\sqrt{\frac{1}{10}+\frac{1}{15}}}=2.167$

$p_v =2*P(t_{23}$

We see that the p value is lower than the significance level provided of 0.05 so then we have enough evidence to conclude that the true means are different at 5% of significance.

Step-by-step explanation:

Data given

$n_1 =10$ represent the sample size for group 1

$n_2 =15$ represent the sample size for group 2

$\bar X_1 =1085$ represent the sample mean for the group 1

$\bar X_2 =1034$ represent the sample mean for the group 2

$s_1=52$ represent the sample standard deviation for group 1

$s_2=61$ represent the sample standard deviation for group 2

We are assuming that the two samples are normally distributed with equal variances and that means:

$\sigma^2_1 =\sigma^2_2 =\sigma^2$

System of hypothesis

Null hypothesis: $\mu_1 = \mu_2$

Alternative hypothesis: $\mu_1 \neq \mu_2$

The statistic is given by:

$t=\frac{(\bar X_1 -\bar X_2)-(\mu_{1}-\mu_2)}{S_p\sqrt{\frac{1}{n_1}+\frac{1}{n_2}}}$

The degrees of freedom are given by:

$n_1+n_2 -2$

And the pooled variance is:

$S^2_p =\frac{(n_1-1)S^2_1 +(n_2 -1)S^2_2}{n_1 +n_2 -2}$

Replacing we got:

$S^2_p =\frac{(10-1)(52)^2 +(15 -1)(61)^2}{10 +15 -2}=3323.043$

And the deviation would be:

$S_p=57.646$

The degrees of freedom are:

$df=10+15-2=23$

The statistic would be:

$t=\frac{(1085 -1034)-(0)}{57.646\sqrt{\frac{1}{10}+\frac{1}{15}}}=2.167$

The p value would be

$p_v =2*P(t_{23}$

We see that the p value is lower than the significance level provided of 0.05 so then we have enough evidence to conclude that the true means are different at 5% of significance.

6 0

3 years ago

Which equation is the Gizmo using to find the x coordinates

wlad13 [49]

Answer:

The correct answer is C. $(0,10)$ .

Step-by-step explanation:

The polar coordinates are defined in terms of r and θ, where r is the distance of the point from the origin and θ is the angle made with the positive x-axis.

To convert from Polar Coordinates (r, θ) to Cartesian Coordinates (x, y) apply the following conversion formulas:

$x = r\cos \theta \\y = r\sin \theta$

We know that $r=10$ and $\theta = 0.5\pi$

So, the cartesian coordinates are,

$x=10\cos \left(0.5\pi \right)=10\cos \left(\frac{1}{2}\pi \right)=10\cos \left(\frac{\pi }{2}\right)\\\\\mathrm{Use\:the\:following\:trivial\:identity}:\quad \cos \left(\frac{\pi }{2}\right)=0\\\\x=10\cdot \:0\\x=10$

$y=10\sin \left(0.5\pi \right)=10\sin \left(\frac{1}{2}\pi \right)=10\sin \left(\frac{\pi }{2}\right)\\\\\mathrm{Use\:the\:following\:trivial\:identity}:\quad \sin \left(\frac{\pi }{2}\right)=1\\\\y= 10$

The correct answer is C. $(0,10)$ .

7 0

4 years ago

A circus ticket costs $7. On weekdays, the circus sells tickets at a 15% discount. What is the amount of the discount? How much

Airida [17]

Take the original price and multiply it by the percentage (not in percentage form) and divide it by 100

(7*15)/100=1.05

<u>$1.05 is the discount
</u>
7-1.05=5.95

<u>$5.95 is the ticket cost on a weekday</u>

4 0

3 years ago

Read 2 more answers

What is the area of this triangle?

Wewaii [24]

Answer:

Step-by-step explanation:

6 0

3 years ago