Question

Plz help me with the answer

Answer 1

Answer:

$2 \div 714$

first part

$205 \div 1323$

second

Answer 2

POINTS TO NOTICE:-

1. IN QUESTIONS RELATED TO SOLVING PROBLEMS ON PROBABILITY
2. ALWAYS TAKE THE SUM OF TOTAL OF THE OUTCOME OF THE QUESTION
3. NOW SELECT THAT PART FROM THE QUESTION THAT HAS TO BE ANSWERED
4. ALWAYS USE PRIMARY FORMULA NO. OF OUTCOME/ TOTAL NO. OF OUTCOME

--------☆☆ EXTRA BRAINLY KNOWLEDGE☆☆---------

• Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur or how likely it is that a proposition is true.

• Probability is a number between 0 and 1, where, roughly speaking, 0 indicates impossibility and 1 indicates certainty.

• Probability of a no. is written as no. of OUTCOMES

total no. of OUTCOMES

• for an no. in the form of not an event the probability( not event ) = 1 - probability ( event )

• Theoretical Probability

It is based on the possible chances of something to happen.

• Experimental Probability

It is based on the basis of the observations of an experiment.

• Axiomatic Probability

In axiomatic probability, a set of rules or axioms are set which applies to all types.

GIVEN:-

SOME FAMILIES WITH 2 CHILDREN ARE SURVEYED

NO. OF FAMILIES |NO. OF FAMILIES

WITH GIRLS |

0 | 184

1 | 714

2 | 425

TO FIND:-

IF FAMILIES ARE CHOSEN AT RANDOM

1. EXACTLY ONE GIRL

2. EXACTLY 2 GIRLS

SOLUTION:-

AS YOU SEE,

FOR PART 1

NO. OF FAMILIES WITH EXACT 1 GIRL ARE 714

AND ALSO AS PER POINTS ABOVE ,

TOTAL NO. OF FAMILIES = 184 + 714 + 425

TOTAL NO. OF FAMILIES = 1323

SO PROBABILITY = 714 / 1323

FOR PART 2

NO. OF FAMILIES WITH EXACT 0 GIRL ARE 184

SOME THING TO REMEMBER IS THAT AS 2 CHILDREN ARE SURVEYED

SO NO. OF 0 GIRLS MEANS THE FAMILY HAS 2 BOYS ( INDIRECTLY )

THAT IS THE NO. OF FAMILIES OF 2 BOYS ARE 184

SO PROBABILITY = 184 / 1323

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