According to the normal distribution table, the probability that their mean blood pressure will be less than 127 is 99.38%.
Given :
Blood pressure readings are normally distributed with a mean of 125 and a standard deviation of 8.
The formula of z-score is used to determine the probability that their mean blood pressure will be less than 127. The formula of z score is given by:
![z = \frac{\frac{x - m}{\alpha } }{\sqrt{n} }](https://tex.z-dn.net/?f=z%20%3D%20%5Cfrac%7B%5Cfrac%7Bx%20-%20m%7D%7B%5Calpha%20%7D%20%7D%7B%5Csqrt%7Bn%7D%20%7D)
Now, substitute the values of known terms in the above equation.
![z = \frac{\frac{127 - 125}{8} }{\sqrt{100} }](https://tex.z-dn.net/?f=z%20%3D%20%5Cfrac%7B%5Cfrac%7B127%20-%20125%7D%7B8%7D%20%7D%7B%5Csqrt%7B100%7D%20%7D)
![z = \frac{\frac{2}{8} }{10} }](https://tex.z-dn.net/?f=z%20%3D%20%5Cfrac%7B%5Cfrac%7B2%7D%7B8%7D%20%7D%7B10%7D%20%7D)
Further, simplify the above expression.
z = 2.5
P(z < 2.5) = 0.9938
So, the probability is 99.38%.
Therefore, according to the normal distribution table, the probability that their mean blood pressure will be less than 127 is 99.38%.
To learn more about probability refer here:
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Answer:
Representative sample is your answer ....
Answer:
He'll have to work for 12 weeks.
Step-by-step explanation:
19.20×25=480.00(how much he earns in a week)
5760/480=12
Answer: (F)
Step-by-step explanation:
Bloooooooooooooooooooooop