The manager of a sawmill wants to find out what percentage of the boards that the mill produced are defective.Which sampling methods are likely to be biased?

Choose all answers that are correct.

A.
The manager selects 20 boards at random each day for 5 days and examines them.

B.
The manager sends an email to 20 customers who buy lumber from the mill, asking each how many of the boards they bought the past week were defective. Results from the first 5 customers to respond are tallied.

C.
On 1 day, an hour after the sawmill begins production, 30 boards in a row are selected and examined.

D.
Every 40th board produced over the course of 1 week is selected and examined.

Answers

Answer 1

Answer: The sampling method that is most bias is:

B.
The manager sends an email to 20 customers who buy lumber from the mill, asking each how many of the boards they bought the past week were defective. Results from the first 5 customers to respond are tallied.

C.
On 1 day, an hour after the sawmill begins production, 30 boards in a row are selected and examined.

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Increase 220 by 15% please

Answers

Lets do this step by step.

1st.) what is 15% as a decimal
15% = 0.15

2nd.) multiply
220 x 0.15 = 33

3rd) we add that 33 and 220 since this its asking for the increase
220 + 33 = 253

Answer = 253

Please help 6n^2-5n^2-7n^2 simplify the expression

Answers

Since 6n^2 and −5n^2 are like terms then add −5n^2 to 6n^2 to get n^2.

n^2−7n^2

Since n^2 and −7n^2 are like terms then add −7n^2 to n^2 to get −6n^2.

The answer is −6n^2

2|x+8|=20
Plz show work

Answers

Answer: x=2, or x=-18

Step-by-step explanation:

Since anything in an absolute value can be positive or negative (since in an absolute value, everything has to be positive since absolute value measures distance and distance cannot be a negative), so |x+8| can become either (x+8) or [-(x+8)].

Our first equation: (after I've removed absolute value)

2(x+8)=20

2x+16=20

2x=4

x=2

And our second equation: (after I've removed absolute value):

-2(x+8)=20

-2x-16=20

-2x=36

x=-18

(6z²+z-1)(9z-5) polynomial equation

Answers

Hi there, (6z²+z-1)(9z-5)=(6z²+z+-1)(9z+-5)=(6z²)(9z)+(6z²)(-5)+(z)(9z)+(z)(-5)+(-1)(9z)+(-1)(-5)=54z³-30z²+9z²-5z-9z+5=54z³-21z²-14z+5. Therefore, the answer is 54z³-21z²-14z+5.

Alan has scored 99, 85, and 74 on his previous three tests. What score does he need on his next test so that his average (mean) is 83?

Answers

(99+85+74+x)/4=83
multiply both by 4
99+85+74+x= 332
258+x=332
subtract 258 both sides
x= 74

He must get a 74.

To check answer:
99+85+74+74= 332
332/4 = 83

It’s right!

Hope it helps

Whats the least common factor of 20,44,88

Answers

The least common factor of any group of whole numbers is ' 1 '.

The greatest common factor of those three numbers is 4 .

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