2 years ago

7 times the quantity y divided by 4

Mathematics

1 answer:

Anarel [89]2 years ago

4 0

1.75 is the answer. Hope this helps.

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The ages of trees in a forest are normally distributed with a mean of 25 years and a standard deviation of 4. Approximately what

harkovskaia [24]

Answer:

78.88%

Step-by-step explanation:

We have been given that

$\mu=25,\sigma=4,x_1=20,x_2=30$

The z-score formula is given by

$z-\text{score}=\frac{x-\mu}{\sigma}$

For $x_1=20$

$z_1=\frac{20-25}{4}\\\\z_1=-1.25$

For $x_2=30$

$z_2=\frac{30-25}{4}\\\\z_2=1.25$

Now, we find the corresponding probability from the standard z score table.

For the z score -1.25, we have the probability 0.1056

For the z score 1.25, we have the probability 0.8944

Therefore, the percent of the trees that are between 20 and 30 years old is given by

0.8944 - 0.1056

= 0.7888

=78.88%

6 0

3 years ago

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Ok i need yall help please 15=x+23-2x

Elena L [17]

X = 8 and yeah that’s all

4 0

2 years ago

I am a fraction and I am equivalent to 4/9. If my numerator is 28. Who am I?

aksik [14]

The answer should be 27/63

8 0

3 years ago

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What is 9×8 I hope you explain it

n200080 [17]

9 x 8 = 72

9 + 9 +9 + 9 + 9 +9 + 9 + 9 = 72

6 0

3 years ago

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Elaine is 8 years younger than her brother Tyler. The sum of their ages is 34. What are Elaine's and Tyler's age?

antoniya [11.8K]

Here, Elaine = Tyler + (-8)

⇒ Elaine + 0 + Tyler + 0 = 34
⇒ Tyler + (-8) + 0 + Tyler + 0 = 34

And, Tyler = [(34 - (0) - (-8)] / 2

Thus, Tyler = 21
And, Elaine = 21 + (-8)
=13

∴ Tyler = 21 & Elaine = 13

Regards

#Exotic Explorer

4 0

2 years ago

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