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barxatty [35]
3 years ago
5

The average number of acres burned by all wildfires in the united states is 780 acres with standard deviation 500 acres. of cour

se, some wildfires burn thousands of acres, so the distribution of acres burned by wildfires is strongly right skewed. a random sample of wildfires is to be taken. between which 2 values do 94% all sample means fall for samples of size 64? if you dont think the last answer is the correct answer, then choose the answer closest to the number you calculated.
Mathematics
1 answer:
shusha [124]3 years ago
7 0
Mmmmmmmmmmmmmmmmmmmmmmmmmmmm
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The average age of staff in the maths department is 40.
pashok25 [27]

Answer:

Cerian is 28 years old

Step-by-step explanation:

The given parameters are;

The average age of the staffs in the mathematics department = 40

The number of staffs in the department = 7

The average age of Jill, Nicky and Wendy = 41

The average age of Andy, Alan and Cathy = 43

From the given parameters, we have;

The average age of the staffs in the mathematics department = (The sum total of the ages of the members of the math department)/(The number of staffs in the department)

Therefore;

40 = (The sum total of the ages of the members of the math department)/ (7)

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The sum total of the ages of the members of the math department = 40 × 7 = 280

Which gives;

Jill's age + Nicky's age + Wendy's age + Cathy's age + Cerian's age + Alan's age + Andy's age = 280 years

The average age of Jill, Nicky and Wendy = 41

Given that Jill, Nicky, and Wendy make up 3 of the 7 members of staffs, we have;

The average age of Jill, Nicky and Wendy = (The sum total of the ages of Jill, Nicky, and Wendy)/(The number of staff Jill, Nicky, and Wendt make)

Therefore;

The sum total of the ages of Jill, Nicky, and Wendy = 41 × 3 = 123

Which gives;

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Similarly, the sum total of the ages of Andy, Alan, and Cathy = 43 × 3 = 129

Which gives;

Andy's age + Alan's age + Cathy's age = 129 years

Therefore;

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∴ Cerian's age = 280 years - 123 years - 129 years = 28 years

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3 years ago
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hi sister

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Im also a girl teehee

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2 years ago
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A. 84

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