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3 years ago

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Suppose a research firm conducted a survey to determine the average amount of money steady smokers spend on cigarettes during a

week. A sample of 100 steady smokers revealed that the sample mean is $20 and the sample standard deviation is $5. What is the probability that a sample of 100 steady smokers spend between $19 and $21?
a.0.4772
b.0.0228
c.0.9544
d.$20

1 answer:

olchik [2.2K]3 years ago

3 0

Answer:

option (b) 0.0228

Step-by-step explanation:

Data provided in the question:

Sample size, n = 100

Sample mean, μ = $20

Standard deviation, s = $5

Confidence interval = between $19 and $21

Now,

Confidence interval = μ ± $z\frac{s}{\sqrt n}$

thus,

Upper limit of the Confidence interval = μ + $z\frac{s}{\sqrt n}$

or

$21 = $20 + $z\frac{5}{\sqrt{100}}$

or

z = 2

Now,

P(z = 2) = 0.02275 [From standard z vs p value table]

or

P(z = 2) ≈ 0.0228

Hence,

the correct answer is option (b) 0.0228

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