From past, a company knows that in cartons of bulbs, 90% contain no defective bulbs, 5% contain one defective bulb, 3% contain two defective bulbs, and 2% contain three defective
bulbs. Find the mean and standard deviation for the number of defective bulbs.

The mean is M=0.17 defective bulbs.

The standard deviation is s=0.165 defective bulbs.

Step-by-step explanation:

We can calculate the mean as the sum of the product between the number of defective bulbs and its proportion:

The standard deviation can be calculated  as the sum of the product between the deviation from the mean for each number of defective bulbs and its proportion:

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)

step-by-step explanation:

idk the answer i want to say 10 but then it would be equal so try 9 but then yeah so yeah we love edgen