A headline in a certain newspaper states that "most stay at first job less than 2 years." That headline is based on an online
1 answer:
Answer:
Mean, μ = 200
Standard deviation, σ = 10
Step-by-step explanation:
Data provided:
a) true percentage of graduates who stay at their first job less than two years
p = 50% = 0.5
q = 1 - p = 1 - 0.5 = 0.5
Number of graduates selected in a group, n = 400
Now,
The mean is calculated as:
Mean, μ = p × n
or
μ = 0.5 × 400 = 200
and,
standard deviation, σ =
or
σ =
or
σ = √100
or
σ = 10
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Answer:
Curved parenthesis at negative infinity
Square bracket at -4
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Work Shown:
The last inequality shown above is the same as saying
Converting this to interval notation leads to the final answer of
Note the use of a square bracket at -4 to include this endpoint. We can never include either infinity, so we always use a parenthesis for either infinity.