2 years ago

Is it anyone up here that can help me with this question please anyone please

Mathematics

1 answer:

pentagon [3]2 years ago

6 0

I'm going to guess B but I'm not sure

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A college-entrance exam is designed so that scores are normally distributed with a mean of 500 and a standard deviation of 100.

Crank

Answer: 1.25

Step-by-step explanation:

Given: A college-entrance exam is designed so that scores are normally distributed with a mean $(\mu)$ = 500 and a standard deviation $(\sigma)$ = 100.

A z-score measures how many standard deviations a given measurement deviates from the mean.

Let Y be a random variable that denotes the scores in the exam.

Formula for z-score = $\dfrac{Y-\mu}{\sigma}$

Z-score = $\dfrac{625-500}{100}$

⇒ Z-score = $\dfrac{125}{100}$

⇒Z-score =1.25

Therefore , the required z-score = 1.25

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2 years ago

0.3(5x - 1.5) = 7.5 x= ?

vfiekz [6]

Answer:

x=5.3

Step-by-step explanation:

.3(5x-1.5)=7.5

1.5x-.45=7.5

1.5x=7.95

x=5.3

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2 years ago

What times what equals 36 but also adds up to -9?

Virty [35]

-12 and 3 add up to -9 but multiply to 36.

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2 years ago

Max has 5 red model cars. One third of his model cars are red. How many model cars does Max have?

Ber [7]

5=red
1/3 of all=red
1/3 of all=5
3/3 of all=all=1/3 times 3/1=5 times 3/1=15

15 total

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2 years ago

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Find the smallest n for which the numbers 1^2, 2^2, 3^2, 4^2, ....n^2 can be split into two groups with the same sum.

yan [13]

Answer:

yjfh

Step-by-step explanation:

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2 years ago