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3 years ago

Plz help me i dotn know this

Mathematics

2 answers:

Snowcat [4.5K]3 years ago

8 0

Answer:

my to that is why im search for the answer

miv72 [106K]3 years ago

3 0

Answer:

it's D. I think 105 cubic feet

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Rainwater was collected in water collectors at thirty different sites near an industrial basin and the amount of acidity (pH lev

stiv31 [10]

Answer:

The mean and standard deviation of the corrected pH measurements are 6.63 and 3.8025 respectively.

Step-by-step explanation:

We can correct the values of the mean and standard deviation using the properties of the mean and the variance.

To the original value X we have to add 0.2 and multiply then by 1.3 to calculate the new and corrected value Y:

$Y=1.3(X+0.2)$

The mean and standard deviation of the original value X are 4.9 and 1.5 respectively.

Then, we can apply the properties of the mean as:

$E(Y)=E(1.3(X+0.2))=1.3E(X+0.2)=1.3E(X)+1.3*0.2\\\\E(Y)=1.3E(X)+0.26\\\\E(Y)=1.3*4.9+0.26=6.37+0.26=6.63$

For the standard deviation, we apply the properties of variance:

$V(Y)=V(1.3(X+0.2))\\\\V(Y)=1.3^2\cdot V(X+0.2)\\\\V(Y)=1.69\cdot V(X)\\\\V(Y)=1.69\cdot 1.5^2=1.69\cdot 2.25=3.8025$

The properties that have been applied are:

$1.\,E(aX)=aE(X)\\\\ 2.\,E(X+b)=E(X)+b\\\\3.\,V(aX)=a^2V(X)\\\\4.\,V(X+b)=V(X)+0$

3 0

3 years ago

The circle has a radius of 4 what is the diameter of the circle

valentina_108 [34]

Answer:

Step-by-step explanation:

radius is half the diamiter

7 0

2 years ago

Read 2 more answers

The angle measures 22°, 62°, 118°, and 158° are written on slips of paper. You choose two slips of paper at random.

mylen [45]

Answer: 1/3

There are C(4,2) = 6 ways to choose a pair of numbers. Only 2 of those pairs are supplementary measures {22, 158} and {62, 118}. The probability is 2/6 = 1/3.

3 0

2 years ago

How do you use multiplication and the distributive property to find 144÷8

yuradex [85]

You can do 144 times 1/8, which is the same thing as <span>144÷8.
The answer is 18.</span>

4 0

2 years ago

There are 12 counters in a bag.

astraxan [27]

Answer:

number of green counters

=12-3+1+2

number of green and yellow counters

=6+2

probability of getting green or yellow counter

=8/12

=2/3

Step-by-step explanation:

5 0

2 years ago