Answer:
Each of these is based on the principle of difference of two squares where:
Step-by-step explanation:
1.
2.
3.
4.
Formula to find mean and standard deviation is,
Means = np and standard deviation =.
Where n= sample size, p = probability.
According to the given problem, the probability that an individual has 20 vision is 0.19 in a class of 70 students. So,
p = 0.19 and n = 70.
Hence, the first step is to plug in these values in the above formula to get mean and standard deviation. Therefore,
Mean = np
= 70* 0.19
= 13.3
= 13.300 (Rounded to nearest thousandth.
Standard deviation =
=
=
=√10.773
=3.282224855
= 3.282 (Rounded to nearest thousandth).
<u>Equation/Question:</u>
-6x-(-8)=2
<u>Answer/Way I did it:</u>
1. Remove parentheses.
-6x+8=2
2. Subtract 8 from both sides.
-6x=2-8
3. Simplify 2-8 to -6.
-6x=-6
4. Divide both sides by -6.
<u>x=1</u>
-------------
<u>Checking:</u>
<u>Equation/Question:</u>
−6x−(−8)=2
----------------------
1. Let x=1.
−6×1+8=2
2. Simplify -6×1 to −6.
-6+8=2
3. Simplify -6+8 to 2.
2=2
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<u>Done by NeighborhoodDealer</u>
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