HELP PLEASE SOME ONE HELP ME PLEASEEEEEEEEEE

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.

I think C and D am i correct ?

Answers

Answer 1

Answer:

Answer:

I'm pretty sure it's C and D

Step-by-step explanation:

Answer 2

Answer:
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. Are the correct answers

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Sammy picks blueberries and cherry tomatoes. • She earns $3.00 for each pint of blueberries and $2.00 for every pint of cherry tomatoes she picks.
• Sammy earned a total of $28.00.
• She picked twice as many pints of tomatoes as blueberries.
How many pints of blueberries did Sammy pick?

Answers

Answer:

Step-by-step explanation:

b = pints of blueberries

c = pints of cherry tomatoes

3b + 2c = 28

2b = c

First, substitute 2b into the c of the first equation.

3b + 2(2b) = 28

3b + 4b = 28

7b = 28

b = 4

Then, substitute 4 into the b of the second equation.

2(4) = c

c = 8

Then, substitute both values into the first equation to check.

3(4) + 2(8) = 28

12 + 16 = 28

For the following geometric sequence find the recursive formula: {-1, 3, -9, ...}.

Answers

Based on these first few terms, we can deduce that the next term is computed by switching the sign of the previous one, and multiplying it by 3: we start with -1, we switch the sign (1) and multiply by 3 (3); then again we switch the sign (-3) and multiply by 3 (-9), and so on.

Since switching sign is the same as multiplying by -1, we can compute every next term by multiplying the previous one by -3:

$a_1 = -1\na_2 = a_1\cdot(-3) = (-1)\cdot(-3)=3\na_3 =a_2\cdot(-3)=3\cdot(-3)=-9$

So, the recursive formula is

$a_n = -3a_(n-1)$

because it states precisely that the next term is -3 times the previous one.

HELP PLEASE!!!!!!!A box contains 4 oranges, 9 apples, and 3 pears. Liliana selects a piece of fruit from the box at random.

What is the probability that she selects an orange or a pear?

Answers

Answer: The probability that she selects an orange or a pear is 7/16.

Step-by-step explanation:

Given number of oranges = 4,

Apples = 9,

Pears = 3,

Total number of fruits = 4 + 9 + 3 = 16,

If she selects a piece of fruit from the box at random,

Then, the probability that she selects an orange or a pear

= The probability of oranges + The probability of oranges

$=(^4C_1)/(^(16)C_1)+(^3C_1)/(^(16)C_1)$

$=(4)/(16)+(3)/(16)$

$=(7)/(16)$

7 out of 16 . so therefore you add the number of oranges and pairs then on the number 16 you just add all pieces of friut

Need help with math's home work1 - increase 235 by 27%
2 - increase 24g by 9%
3 - decrease 1120 of 13.5%
4 - decrease 0.057 by 55%

sally investment of £450 has gone up by 30%, while susies has gone down by 10% from 650. who has got the highest amont of money

Answers

1. The best thing to do is to find out what 1% is. 235/100= 2.35
As you're looking for 27%, you then multiply 2.35*27= 63.45
As you're increasing it, you've then got to add this to the original amount.
235+63.45= 298.45

2. Again, find 1%. 24/100= 0.24
0.24*9= 2.16
24+2.16= 26.16

3. Find 1%. 1120/100= 11.2
As you're looking for 13.5%, you then multiply this by 13.5
11.2*13.5= 151.20
As you're subtracting, you then take this away from the original number.
1120-151.20= 968.80

4. This time, you can find 10%.
0.057/10= 0.0057
0.0057*5.5= 0.03135.
You've then got to subtract this as you're decreasing the number.
0.057-0.03135= 0.02565.

Sally's investment is now worth £585. (Find the 30% and add it on) and Susie's investment is now worth £585 (Find the 10% and subtract). They both have the same amount of money.

Hope this helps :)

What is the length side of a triangle that has vertices at (-5, -1), (-5, 5), and (3, -1)?