box contains 100 bolts of which 9 are defective. Find the probability that a bolt chosen at random is not defective.

91/100

0.91 To find the probability that a bolt chosen at random is not defective, we need to know the total number of bolts and the number of non-defective bolts.

In this case, we are given that there are 100 bolts in total and 9 of them are defective. To find the number of non-defective bolts, we subtract the number of defective bolts from the total:

Number of non-defective bolts = Total number of bolts - Number of defective bolts
= 100 - 9
= 91

So, there are 91 non-defective bolts.

The probability of choosing a non-defective bolt at random can be calculated by dividing the number of non-defective bolts by the total number of bolts:

Probability of choosing a non-defective bolt = Number of non-defective bolts / Total number of bolts
= 91 / 100
= 0.91

Therefore, the probability that a bolt chosen at random is not defective is 0.91 or 91%.