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tino4ka555 [31]
3 years ago
7

I need help please.​

Mathematics
1 answer:
pshichka [43]3 years ago
3 0

Answer:

e

Step-by-step explanation:

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Assume the random variable X is normally distributed with mean mu equals 50 and standard deviation sigma equals 7. Compute the p
drek231 [11]

Answer:

The probability that <em>X</em> is less than 42 is 0.1271.

Step-by-step explanation:

The random variable <em>X </em>follows a Normal distribution.

The mean and standard deviation are:

E (X) = <em>μ</em> = 50.

SD (X) = <em>σ</em> = 7.

A normal distribution is continuous probability distribution.

The Normal probability distribution with mean µ and standard deviation σ is given by,

f_{X}(\mu, \sigma)=\frac{1}{\sigma\sqrt{2\pi}}e^{-(x-\mu)^{2}/2\sigma^{2}};\ -\infty

To compute the probability of a Normal random variable we first standardize the raw score.

The raw scores are standardized using the formula:

z=\frac{x-\mu}{\sigma}

These standardized scores are known as <em>z</em>-scores and they follow normal distribution with mean 0 and standard deviation 1.

Compute the probability of (X < 42) as follows:

P(X

*Use a <em>z</em>-table for the probability.

Thus, the probability that <em>X</em> is less than 42 is 0.1271.

The normal curve is shown below.

6 0
3 years ago
How many kilometers are there in 4 miles?
raketka [301]
There are 6.4 Kilometers in 4 miles
3 0
2 years ago
Jessamine wants to ride her bike at least 85 miles per week. She rides to and from school 5 days per week. Her house is 6.25 mil
Juli2301 [7.4K]

its a because 5 (2) (6.25)+2.5t has to at least equal 85.

6 0
3 years ago
Read 2 more answers
QUICK HOW DO YOU SIMPLIFY THIS EQUATION
Yanka [14]
20.25-9(1/2)+11
=20.25-4.5+11
=26.75
3 0
3 years ago
A. y = - 1/4x +9
Vikentia [17]
It's B= 1/4x+6 because I solve it
6 0
2 years ago
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