PProbability for class VII
Chance:
Impossible : You can’t get 15 out of 10 mark in a test.
Possible: It will rain today.
Certain: A hare runs faster than a turtle
Possibility is again divided into 3 types :
Even Chance or Equally likely
More likely
Less Likely ( Unlikely )
Challenge:
A person with O, A, B or AB blood group can safely donate blood to a person with AB position blood group. Describe the event “a randomly chosen person could donate blood to a person with AB positive blood group” as certain / likely/ unlikely / impossible.
MCQ:
- The probability of being chosen a team is 9%. This event can be described as:
a) likely
b) certain
c) having an even Chance
d) unlikely
2. It will be a Thursday in one of the next 7 days. The event is
a) likely
b) unlikely
c) certain
d) having an even chance
3. Viswa has 7 movies in his video collection and 2 of them feature his favourite actor. If he randomly chooses a movie , what is the probability that he will one featuring his favourite actor?
a) 1/2
b) 2/7
c) 5/7
d) 1/5
4. During a class survey , it was found out that cheese pizza is the favorite snack for 30 out of 40 students. What is the probability in percent that a student’s favourite snack is a cheese pizza?
a) 50%
b) 60%
c) 75%
d) 80%
Important Formula:
Remember Following:
Impossible = 0
Unlikely = ¼
Even chance = ½
Likely = ⅓
Certain = 1
