Incomplete question, but use the following example as an illustration.
Step-by-step explanation:
Say one person had $200 in a savings account last month and now has $225. That's an increase. The problem is to find the percent of increase in money.
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Answer:
He must survey 123 adults.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the z-score that has a p-value of
.
The margin of error is:

Assume that a recent survey suggests that about 87% of adults have heard of the brand.
This means that 
90% confidence level
So
, z is the value of Z that has a p-value of
, so
.
How many adults must he survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage?
This is n for which M = 0.05. So






Rounding up:
He must survey 123 adults.
Answer:more people will be living in Africa than in Asia sometime around 2120
Step-by-step explanation:
Answer:
458,000
Step-by-step explanation:
Answer:
I think its C if I’m wrong sorry
Step-by-step explanation: