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o-na [289]
3 years ago
12

What number should be placed in the box to help complete the division calculation?

Mathematics
1 answer:
brilliants [131]3 years ago
7 0

Answer:

180

Step-by-step explanation:

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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
Read 2 more answers
Please help me I'm stuck on this one
AysviL [449]
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8 0
3 years ago
A school wants to buy a chalkboard that measures 3 feet by 4 feet the chalkboard cost $6.14 per square foot. How much will the c
ElenaW [278]

Answer:

$49.12

Step-by-step explanation:

8 0
3 years ago
Michela’s skateboard ramp is at an incline of 40°. When she attempts a trick on the ramp, she finds that it is too steep. She ad
marissa [1.9K]

Answer:

22.7604763 degrees

Step-by-step explanation:

Note that the answer is NOT 20 degrees.

She adjusted the ramp to half the original <em>incline</em>

Therefore we have tan 40 = x = 0.839099631.

We want an incline of y degrees where tan y = x/2 = 0.839099631/2 = 0.419549815

Taking the arctan of both sides, we get

y = arctan(0.419549815) = 22.7604763 degrees

8 0
2 years ago
Solve 0 = -1.8y + 0.72. What is y = to?<br> 1.0.4<br> 2.-0.4<br> 3.0.8<br> 4.1.8
PIT_PIT [208]

Answer:

0.4

Step-by-step explanation:

just solve it like an equation.

4 0
2 years ago
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