Home
Class 9
MATHS
There are 6 defective items in a sample ...

There are 6 defective items in a sample of 20 items, one item is drawn at random. The probability that it is a non - defective item is …………………. .

A

`2/3`

B

`3/(10)`

C

`(7)/(10)`

D

0

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • PROBABILITY

    FULL MARKS|Exercise Assignment (Answer the following questions)|5 Videos
  • PROBABILITY

    FULL MARKS|Exercise Additional Question Solved|10 Videos
  • MENSURATION

    FULL MARKS|Exercise Assignment (II. Answer the following questions)|8 Videos
  • REAL NUMBERS

    FULL MARKS|Exercise Text Book Activity (Activity 3:)|1 Videos

Similar Questions

Explore conceptually related problems

There are 6 defective items in a sample of 20 items. One item is drawn at random. The that it is probability a non-defective item is

A factory has two Machines - I and II. Machine - I produces 60% of items and Machine -II produces 40% of the items of the total output . Further 2% of the items produced by Machine-I are defective whereas 4% produced by Machine -II are defective . If an item is drawn at random what is the probability that it is defective ?

There are 5% defective items in a large bulk of items. What is the probability that a sample of 10 items will include not more than one defective items?

There are 5% defective items in a large bulk of items. What is the probability that a sample of 10 items will include not more than one defective item?

A factory has two Machines-I and II. Machines- produces 25% of items and Machine-II produces 75% of the items of the total output. Further 3% of the items produced by Machine-I are defective whereas 4% produced by Machine - Il are defective. If an item is drawn at random what is the probability that it is defective?

A factory has two Machines - I and II. Machine-I produced 60% if items and Machine - II produces 40% of the items of the total output. Further 2% of the items produced by Machine - I are defective whereas 4% produced by Machine - II are defective. If an item is drawn at random what is the probability that it is defective ?

In a factory Machine-I produces 45% of the output and Machine -II 55% of the outuput. On the average 10% items produced by I and 5% of the items produced by II are deffective. An item is drawn at random from a day's output. (i) find the probability that it is a defective item (ii) if it id defective, what is the probability that it was produced by Machine-II ?