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3 years ago

Which statement is true?

Mathematics

1 answer:

dusya [7]3 years ago

7 0

$\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}$

Actually Welcome to the Concept of the Symmetry,

Option A.) is correct,

=> N has only the Rotational Symmetry.

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Scores on a test are normally distributed with a mean of 81.2 and a standard deviation of 3.6. What is the probability of a rand

Misha Larkins [42]

Answer:

The probability of a randomly selected student scoring in between 77.6 and 88.4 is 0.8185.

Solution:

Given, Scores on a test are normally distributed with a mean of 81.2

And a standard deviation of 3.6.

We have to find What is the probability of a randomly selected student scoring between 77.6 and 88.4?

For that we are going to subtract probability of getting more than 88.4 from probability of getting more than 77.6

Now probability of getting more than 88.4 = 1 - area of z – score of 88.4

$\mathrm{Now}, \mathrm{z}-\mathrm{score}=\frac{88.4-\mathrm{mean}}{\text {standard deviation}}=\frac{88.4-81.2}{3.6}=\frac{7.2}{3.6}=2$

So, probability of getting more than 88.4 = 1 – area of z- score(2)

= 1 – 0.9772 [using z table values]

= 0.0228.

Now probability of getting more than 77.6 = 1 - area of z – score of 77.6

$\mathrm{Now}, \mathrm{z}-\text { score }=\frac{77.6-\text { mean }}{\text { standard deviation }}=\frac{77.6-81.2}{3.6}=\frac{-3.6}{3.6}=-1$

So, probability of getting more than 77.6 = 1 – area of z- score(-1)

= 1 – 0.1587 [Using z table values]

= 0.8413

Now, probability of getting in between 77.6 and 88.4 = 0.8413 – 0.0228 = 0.8185

Hence, the probability of a randomly selected student getting in between 77.6 and 88.4 is 0.8185.

4 0

3 years ago

Blonde or brunette? Explain why (Its for my human interactions course so pls dont report it)

Trava [24]

Answer:

imo i would go with brunette because i don't really like blondes. most ones ive met are annoying.

Step-by-step explanation:

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3 years ago

If 25% more than a number is 325 what is 20% less than the number

Verdich [7]

Let the number be x. Then 1.25x = 325, or x = 260.

20% less than 260 is 0.80(260) = 208

7 0

3 years ago

When is -4.75 'more than' -2.25

meriva

Answer:

if u add 2.5 and more u can also try to remove +

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4 years ago

A pound of crackers costs $2.88. You purchased 1/4 pound of crackers. How much money did you pay?

Maru [420]

Answer:

72 cents

Step-by-step explanation:

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3 years ago

Read 2 more answers