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3 years ago

11

please answer will mark brainalist .the area of a triangle of altitude 15 m is 225 sq.m.whatbis the length of its base please sh

ow steps clearly

1 answer:

Amanda [17]3 years ago

7 0

Step-by-step explanation:

30. i already know this sa. . ....

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How many radians is 90 degrees

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3 years ago

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2 years ago

Read 2 more answers

What is the answer to this question I don't really get it XD.

trapecia [35]

Answer:

It is asking you to solve for x.

Step-by-step explanation:

You can find the hypotenuse of the triangle using the Pythagorean Thereom.

hope this clarifies the problem!

A² + B² = C²

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3 years ago

You are to take a multiple-choice exam consisting of 64 questions with 5 possible responses to each question. Suppose that you h

stepan [7]

Answer:

(a) The expected score is 12.8

(b) The standard deviation is 3.2 and variance is 10.24

Step-by-step explanation:

Consider the provided information.

You are to take a multiple-choice exam consisting of 64 questions with 5 possible responses to each question.

Here n=64 p=1/5 and q=1-1/5=4/5

Part (a) we need to find the expected score on the exam.

Expected = np

Expected score = number of questions × P(right)

$Score = 64 \times \frac{1}{5} = 12.8$

Hence, the expected score is 12.8

Part (b) Compute the variance and standard deviation of x.

Standard Deviation: $\sigma =\sqrt{npq}$

Now calculate the standard deviation as shown:

$\sigma =\sqrt{64\times \frac{1}{5}\times \frac{4}{5}}$

$\sigma =\sqrt{\frac{256}{25}}$

$\sigma =\frac{16}{5}=3.2$

Variance: $\sigma^2 =npq$

$\sigma^2 =64\times \frac{1}{5}\times \frac{4}{5}$

$\sigma^2 =\frac{256}{25}$

$\sigma^2 =10.24$

Hence, the standard deviation is 3.2 and variance is 10.24

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3 years ago