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2 answers:
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There was $135 in Roland's bank account after the two-month period.
Step-by-step explanation:
Step 1:
Roland out $180 in his account at the beginning of July. This reduced by 25% over the next two months.
We need to determine how much 25% of $180 is. To do so we convert 25% into a fraction and multiply with 180.
25% of $180
So an amount of $45 reduced over two months.
Step 2:
To calculate the money Roland has in his account after two months, we subtract the amount reduced from the amount of money in his account at the beginning of July.
The amount of money in his bank account after the two-month period
So there was $135 in Roland's bank account after the two-month period.
a. Let be a random variable representing the weight of a ball bearing selected at random. We're told that
, so
where . This probability is approximately
b. Let be a random variable representing the weight of the
-th ball that is selected, and let
be the mean of these 4 weights,
The sum of normally distributed random variables is a random variable that also follows a normal distribution,
so that
Then
c. Same as (b).