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STatiana [176]
2 years ago
7

A study on students drinking habits wants to determine the true average number of alcoholic drinks all uf underclassmen students

have in a one week period. We know from preliminary studies that the standard deviation is around 2. 8. How many students should be sampled to be within 1. 5 drink of population mean with 90% probability?.
Mathematics
1 answer:
frutty [35]2 years ago
8 0

Answer: 16

Step-by-step explanation:

Standard deviation is 2

Margin error for the problem is 1

Probability 95%, that means thet the siginficance level α is 1 – p

α = 1 – 0.95 = 0.05

margin of error (ME) can be defined as follows

ME = Z(α/2) * standard deviation/ √n

Where n is the sample size

Z(0.05/2) = Z(0.025)

Using a z table Z = 1.96

Now, replacing in the equation and find n

1 = 1.96 * 2/ √n

1 = 3.92 / √n

√n = 3.92

n = 3.92^2

n = 15.36 = 16

i hope this work for you

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Travka [436]

Answer: $55,489.20

Step-by-step explanation:

Given the following information :

Base salary = $10.20 per hour

Overtime pay = $10.20 * 1.5 = $15.3

Average sale per hour = $60

Tips = 20% of sale

Regular shift hour = 8hours

Work week:

3 10-hour shift = 24hrs regular (6 hrs overtime)

1 11 - hour shift = 8hrs regular (3 hrs overtime)

1 5 - hour shift = 5 hours

Total hours per week = 37hrs regular, 9hrs overtime

WEEKLY :

Income from tips = $60 * 46 * 0.2 = $552

Regular pay: 37 * 10.20 = $377.40

Overtime: 9 * $15.30 = $137.70

Total = $(137.70 + 377.40 + 552) = $1067.10

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Annual gross = $1067.10 * 52 = $55,489.20

7 0
3 years ago
Lisa’s grades on four exams were 80, 92, 86, and 78. What is the lowest grade she can receive on the next exam to have an averag
Andre45 [30]

Answer: It is 86 because it says lowest  and greater than

85 so there is your answer have a nice day

Step-by-step explanation:

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3 years ago
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5 0
3 years ago
A population of rabbits is increasing continuously at a rate of 20% each year. If there were 25 rabbits in the year 2012, how ma
mario62 [17]

Answer:

62

Step-by-step explanation:

20% as a decimal is 0.2

For each year get the amount of increase by multiplying the number of rabbits by 0.2

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3 years ago
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