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The heights of the trees in a forest are normally distributed, with a mean of 25 meters and a standard deviation of 6 meters.

What is the probability that a randomly selected tree in the forest has a height greater than or equal to 37 meters?

Use the portion of the standard normal table given to help answer the question:

| [tex]$z$[/tex] | Probability |
|------|-------------|
| 0.00 | 0.5000 |
| 0.50 | 0.6915 |
| 1.00 | 0.8413 |
| 2.00 | 0.9772 |
| 3.00 | 0.9987 |

A. 0.13%
B. 0.26%
C. 2.3%
D. 4.6%


Sagot :

To determine the probability that a randomly selected tree in the forest has a height greater than or equal to 37 meters, we will make use of the properties of the normal distribution and the standard normal distribution table.

### Step-by-Step Solution:

1. Identify the given parameters:
- Mean height ([tex]\(\mu\)[/tex]): 25 meters
- Standard deviation ([tex]\(\sigma\)[/tex]): 6 meters
- Specific height ([tex]\(X\)[/tex]): 37 meters

2. Calculate the z-score for the specific height:
The z-score formula is given by:
[tex]\[ z = \frac{X - \mu}{\sigma} \][/tex]
Substituting the known values:
[tex]\[ z = \frac{37 - 25}{6} = \frac{12}{6} = 2.0 \][/tex]

3. Use the standard normal distribution table for the computed z-score:
From the given table:
[tex]\[ z = 2.00 \implies \text{Probability} = 0.9772 \][/tex]
This probability represents the area under the curve to the left of [tex]\( z = 2.00 \)[/tex].

4. Calculate the probability of a tree being greater than or equal to 37 meters:
Since we need the probability of the height being greater than or equal to 37 meters, we need the area to the right of [tex]\( z = 2.00 \)[/tex]. This is given by:
[tex]\[ P(X \geq 37) = 1 - P(X < 37) \][/tex]
Using the value from the standard normal distribution table:
[tex]\[ P(X \geq 37) = 1 - 0.9772 = 0.0228 \][/tex]

5. Convert this probability to a percentage:
[tex]\[ \text{Percentage} = 0.0228 \times 100 = 2.28\% \][/tex]

Therefore, the probability that a randomly selected tree in the forest has a height greater than or equal to 37 meters is [tex]\(2.3\%\)[/tex] (rounded to the nearest tenth of a percent).

### Final Answer:
[tex]\(\boxed{2.3\%}\)[/tex]