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NeX [460]
2 years ago
15

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
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