Four sisters take turns using the computer an equal amount of time each night. They are allowed to use the computer from 4 p.m.
2 answers:
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Answer:
0.3520
Step-by-step explanation:
We have been given that the pulse rates among healthy adults are normally distributed with a mean of 80 beats/second and a standard deviation of 8 beats/second. We are asked to find the proportion of healthy adults have pulse rates that are more than 83 beats/sec.
First of all, we will find z-score corresponding to sample score of 83 as:
, where,
z = Z-score,
x = Sample score,
= Mean,
= Standard deviation.
Upon substituting our given values in z-score formula, we will get:
Now, we need to find the probability that a z-score is greater than 0.38.
Using formula , we will get:
Using normal distribution table, we will get:
Therefore, 0.3520 of healthy adults have pulse rates that are more than 83 beats/sec.