Disks of polycarbonate plastic from a supplier are analyzed for scratch and shock resistance. the results from 100 disks are summarized as follows:
shock resistance
scratch resistance high low
high 70 9
low 16 5
let a denote the event that a disk has high shock resistance, and let b denote the event that a disk has high scratch resistance. if a disk is selected at random, determine the following probabilities. input your answers in the fractional form (do not simplify).
p(a)=86/100
p(b)=79/100
p(a')=7/50
p(a u b)=95/100
p(a' u b)=

Using Venn probabilities, it is found that the desired probability is given by:

The or probability of Venn sets is given by:

In this problem, we want:

We have that:

is probability of A not happening and B happening, thus low shock resistance and high scratch resistance, thus

Then

A similar problem is given at link

Step-by-step explanation:

Let A and B represents the following events.

A denote the event that a disk has high shock resistance.

B denote the event that a disk has high scratch resistance.

Given probabilities:

The probability of intersection of A and B is,

Substitute the above values.

The probability of union of A' and B is,

Substitute the above values.

Therefore, .

d) -1

step-by-step explanation:

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)