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drek231 [11]
3 years ago
6

Assume that blood pressure readings are normally distributed with a mean of 123 and a standard deviation of 9.6. If 144 people a

re randomly selected, find the probability that their mean blood pressure will be less than 125.
a) 0.9938
b) 0.9998
c) 0.0062
d) 0.8615
Mathematics
1 answer:
Vanyuwa [196]3 years ago
8 0

Answer:

The probability is 0.9938

Step-by-step explanation:

In this question, we are asked to calculate the probability that the mean blood pressure readings of a group of people is less than a certain reading.

To calculate this, we use the z score.

Mathematically;

z = (mean - value)/(standard deviation/√N)

From the question, we can identify that the mean is 125, the value is 123 , the standard deviation is 9.6 and N ( total population is 144)

Let’s plug these values;

z = (125-123)/(9.6/√144) = 2.5

Now we proceed to calculate the probability with a s score less than 2.5 using statistical tables

P(z<2.5) = 0.9938

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$ 347 multiply by 25% or 0.25

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3 years ago
Pick the correct answer <br> Please help thanks :)
meriva

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B

Step-by-step explanation:

First create the equation that has slope of -1 in the form of y=mx+b. Because the slope is -1, m=-1, so the equation is y=-x+b. Now we see that we are given the point (-3, 8) as an intersection point. Substitute x and y for -3 and 8 in our equation. With this information, our equation becomes 8=3+b. Solving, b=5. Our equation is now y=-x+5.

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5 0
2 years ago
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3 years ago
Read 2 more answers
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