Answer:The correct option is a)
The upper limit of successes that would be deemed to be usual is 5, so more than 5 successes would be unusual.
Step-by-step explanation:
The mean of a binomial distribution
μ= np where n=10 and p= 0.2 q= 1-p, q= 1-0.2=0.8
μ= 10×0.2=2
σ=√npq
σ=√10×0.2×0.8=1.26
Is unusual for the number of success to be greater than μ + 2.5σ.
= 2+2.5(1.26)
=5 approximately.
So it is unusual for it to be greater than 0.5. The right option Is a)
2800-2100=700
2800/700=4
4% decrease
20{5[100-2(50)+20]}
20{5[100-100+20]}
20{5[20]}
20(100)
20000
After solving the equation 
we get values of x: 
Step-by-step explanation:
We need to find the value of x from the equation:
Solving the expression:
Using the Zero Factor Principle: if ab=0 then a=0 and b=0
So, 
So, After solving the equation we get values of x:
Keywords: Solving Equations
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