# math

posted by .

A bag contains 100 bolts and 300 nuts 50% of each have been rusted 1 item is chosen at random.
Find the probability that chosen item z rusted or a bolt.

• math -

200/400 = probability of finding rusted object.

100/400 = probability of choosing a bolt

Either-or probability found by adding individual probabilities.

## Similar Questions

1. ### Chemistry

Assume that you had 15 nuts (N) and 10 bolts (B). How many N2B molecules could you make by screwing two nuts onto each bolt?
2. ### statistics

drawer contains 50 bolts and 150 nuts. Half of the bolts and half of the nuts are rusted. If one item is chosen at random, what is the probability that it is rusted or a bolt ?
3. ### MATH

4. 8 bolts and 6 nuts weigh 138 grams. 3 bolts and 5 nuts weigh 71 grams. Work out the weight of the following:- (a) 4 bolts and 3 nuts (b) 11 bolts and 11 nuts (c) 3 bolts and 3 nuts (d) 1 bolt
4. ### statistics

A bag cntains 100 bolts nd 300 nuts 50% f each hv been rusted 1 item z chosen at random. Find da probability dat chosen item z rusted or a bolt.
5. ### Math

Andrew has a bag containing 12 pattern blocks as shown. one block is chosen at random. what is the probability it is a circle. The bag contains 4 circles, 3 triangles, and 4 squares
6. ### Math

A bag contains 3 red, 5 yellow, 2 green and 6 blue marbles. If one marble is chosen at random, replaced, and then a second marble is chosen at random, find the probability of obtaining 2 marbles of different colors.
7. ### Math probability - HELP

A bag contains 3 red, 5 yellow, 2 green and 6 blue marbles. If one marble is chosen at random, replaced, and then a second marble is chosen at random, find the probability of obtaining 2 marbles of different colors.
8. ### Statistics

Suppose that the probability that an item produced by a certain machine will be defective is 0.2. A sample of 12 items is chosen. Let X be the number of defectives among the selected 12 items. (a) Find the probability of at most 1 …
9. ### sdsdd

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

3 bolts and 3 nuts are in a box. 2 parts are chosen at random. Find the probability that 1 is a bolt and 1 is a nut.

More Similar Questions