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3 years ago

13

Miss Brown will randomly choose a student in justin's class to erase the board. There are 26 students in the class. What is the

probability that Ms. Brown with choose justin to erase the board 2 days in a row?
A: 1%

B: 10%

C: 0.1%

D: 8%

2 answers:

sergejj [24]3 years ago

5 0

Answer:

1%?

Step-by-step explanation:

Dima020 [189]3 years ago

3 0

Answer:

B

Step-by-step explanation:

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Given m<br> n, find the value of x and y.<br> (37-18)<br> (8x+12)<br> m<br> (2X+18)<br> n

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Answer:

Step-by-step explanation:

The two inside angles will sum to 180°.

The top to angles are equal.

Think about this as what if both of the parallel lines were intersected by a perpendicuar line. Every angle would be a right triangle 90°. The inside angles will sum to 180° and the opposite angles are again equal.

(2x + 18) + (8x + 12) = 180

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-------------------------

(3y - 18) = (8x + 12) x = 15

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3 years ago

A pair of dice is rolled. What is the probability that the sum of the dice rolled is either an 11 or a 5?

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Rolling an 11:
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Paula bought p packages of 5 rolls of tape. Then, she bought 2 individual rolls of tape. Which expression shows how many total r

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3 years ago

A scientist studying water quality measures the lead level in parts per billion (ppb) at each of 49 randomly chosen locations al

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Complete Question

The complete qustion is shown on the first uploaded image

Answer:

The correct option is B

Step-by-step explanation:

From the question we are told that

The sample size is $n = 49$

The mean is $\mu = 17ppb$

The standard deviation is $\sigma = 14 ppb$

Generally the standard error of this measurement is mathematically represented as

$\sigma_z = \frac{\sigma}{\sqrt{n} }$

substituting values

$\sigma_{\= x} = \frac{14}{\sqrt{49} }$

$\sigma_{\= x} = 2$ ppb

Now the probability that the mean lead level from the sample of 49 measurements T is less than 15 ppb represented as P(X < 15 )

Next is to find the z value

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

$z = \frac{15-17}{2}$

$z = -1$

Now checking the z-table for the z-score of -1 we have

$P(X$

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4 years ago