Essentials of Statistics for the B...
Essentials of Statistics for the B...
According to a recent, people smile an average of μ = 62 time per day. Assuming that the distribution of smiles is approximately normal with a standard deviation of σ = 18, find each of the following values.
- a. What proportion of people smile more than 80 times a day?
- b. What proportion of people smile at least 50 times a day?
(a)
To Find: The proportion of people smile more than 80 times a day.
Given info:
The random variable X denote the smiles and it follows the normal distribution with mean of
Calculation:
The formula for z score is,
Substitute the value 80 for X, 62 for
(b)
To find: The proportion of people smile at least 50 times a day.
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