Answer:
<em>The correct option is : C. 3.4</em>
Step-by-step explanation:
The probability that a person shopping at a certain store will spend less than $20 is 0.2
That means, here
Given that, the sample size
So, the Mean
Thus, the mean number who spend less than $20 will be 3.4
Answer:
64.62°
Step-by-step explanation:
Use good 'ol SOHCAHTOA. Since we know the hypotenuse and the adjacent values, we use cosine.
Therefore:
Take the inverse cosine of each side:
Inverse cosine of cosine cancel each other out:
Use a calculator:
Therefore the angle is 64.62°
Answer:
The proportion of trees greater than 5 inches is expected to be 0.25 of the total amount of trees.
Step-by-step explanation:
In this problem we have a normal ditribution with mean of 4.0 in and standard deviation of 1.5 in.
The proportion of the trees that are expected to have diameters greater than 5 inches is equal to the probability of having a tree greater than 5 inches.
We can calculate the z value for x=5 in and then look up in a standard normal distribution table the probability of z.
The proportion of trees greater than 5 inches is expected to be 0.25 of the total amount of trees.
