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2 years ago

Help plzzzzzzzz will mark BRAINLYist

Mathematics

1 answer:

maxonik [38]2 years ago

7 0

Answer:

50 degrees is the angle

Step-by-step explanation:

Brainliest?

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Someone help pls -……

uysha [10]

Answer:

d) 35ft

e) 6 seconds

f) 250°

Step-by-step explanation:

If it makes one rotation (360°) in 36 seconds, then it turns 10° every second.

36 secs = 360°

⇒ 1 sec = 360/36 = 10°

d) After 9 seconds, it has turned:

9 x 10 = 90°

Therefore, it will be 15 + 20 = 35ft from the wall

e) 60° = 6 seconds

f) 25 seconds = 25 x 10 = 250°

8 0

2 years ago

1 121 12321 1234321.......56th

Rudik [331]

Answer:

Bro it is too hard to find . Hope you understand me

3 0

3 years ago

A certain change in a process for manufacturing component parts is being considered. Samples are taken under both the existing a

mr_godi [17]

Answer:

And the 90% confidence interval for the difference would be given by:(-0.022;0.0017).

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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".

$p_A$ represent the real population proportion for brand A

$\hat p_A =\frac{80}{2000}=0.04$ represent the estimated proportion for the new process

$n_A=2000$ is the sample size required for Brand A

$p_B$ represent the real population proportion for brand b

$\hat p_B =\frac{75}{1500}=0.05$ represent the estimated proportion for the before process

$n_B=1500$ is the sample size required for before process

$z$ represent the critical value for the margin of error

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

The confidence interval for the difference of two proportions would be given by this formula

$(\hat p_A -\hat p_B) \pm z_{\alpha/2} \sqrt{\frac{\hat p_A(1-\hat p_A)}{n_A} +\frac{\hat p_B (1-\hat p_B)}{n_B}}$

For the 90% confidence interval the value of $\alpha=1-0.90=0.1$ and $\alpha/2=0.05$ , with that value we can find the quantile required for the interval in the normal standard distribution.