2 years ago

The tree diagram represents an experiment consisting of two trials. P(D) = [? ]

Mathematics

1 answer:

joja [24]2 years ago

5 0

Answer:

9 over 11 plus 8 over 12 = 2.7

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Scores on an English test are normally distributed with a mean of 31.5 and a standard deviation of 7.3. Find the score that sepa

vladimir1956 [14]

If $X$ is a random variable representing test scores, then the 41st percentile is the score $x$ such that $P(X\le x)=0.41$ . Transform $X$ to the random variable $Z$ that follows the standard normal distribution via $X=31.5+7.3Z$ :

$P(X\le x)=P\left(\dfrac{X-31.5}{7.3}\le\dfrac{x-31.5}{7.3}\right)=P\left(Z\le\dfrac{x-31.5}{7.3}\right)=0.41$

The $z$ -score for the 41st percentile is about -0.2275, so

$\dfrac{x-31.5}{7.3}\approx-0.2275\implies\boxed{x\approx29.8}$

6 0

4 years ago

jessie estimates the weight of her cat to be 10 pounds. The actual weight of the cat is 13.75 pounds. find the percent error.

bulgar [2K]

Percent error = \frac{measured - actual}{actual} x 100%

The percent error would be 27.27%

8 0

3 years ago

What is the range of y= sec-'(x)? PreCal, send help please!!

beks73 [17]

Given:

The function is:

$y=\sec^{-1}(x)$

To find:

The range of the given function.

Solution:

We have,

$y=\sec^{-1}(x)$

The range of secant inverse function is:

$Range=\{y|0\leq y\leq \pi , y\neq \dfrac{\pi}{2}\}$

The range of the given function in interval notation is:

$Range=\left[0,\dfrac{\pi}{2}\right)\text{ and }\left( \dfrac{\pi}{2}, \pi\right ]$

Therefore, the correct option is C.

6 0

3 years ago

-5/12 x 5/8=???????????????????????????????????????????

Serggg [28]

Answer:

-25/96

Step-by-step explanation:

simplify the expression

3 0

3 years ago

Item 5<br> How many seconds are equal to 3 minutes?

Viktor [21]

Answer:

180 seconds in 3 minutes

Step-by-step explanation:

in 3 minutes there is 180 seconds

4 0

2 years ago