What is Thuy’s error?

Mathematics

2 answers:

tia_tia [17]2 years ago

8 0

Answer:

number b

Step-by-step explanation:

thuy should have written the ratio as 30/39

Gekata [30.6K]2 years ago

3 0

They should me number 29’

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Translate the sentence into an inequality. Eight times the sum of a number and 27 is at most "-15." Use the variable y for the u

strojnjashka [21]

Answer:

8(y + 27) ≤ -15

Step-by-step explanation:

In the given inequality statement, "Eight times the sum of a number and 27 is at most "-15""

The first part, "Eight times the sum of a number and 27" means that 8 is multiplied to the sum of y and 27. While the phrase "at most" means "less than or equal to (≤)" The phrase also implies that the value of y can be -15, or any value less than -15.

Therefore, the correct algebraic expression is: 8(y + 27) ≤ -15

7 0

1 year ago

What is the probability that a randomly selected member of a normally distributed population will lie more than 1.8 standard dev

Helen [10]

Answer:

$P(X> \mu +1.8\sigma)=P(\frac{X-\mu}{\sigma}>\frac{\mu +1.8\sigma-\mu}{\sigma})=P(Z>1.8)$

And we can find this probability using the complement rule:

$P(z>1.8)=1-P(z$

And using the normal standard distirbution table or excel we got:

$P(z>1.8)=1-P(z$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

Let X the random variable that represent the variable if interest of a population, and for this case we know the distribution for X is given by:

$X \sim N(\mu,\sigma)$