Question

Class 10

Mathematics

Chapter 15 - Probality

Formulas Needed

Quality Answer Needed​

Answer 1

$\Huge{\bf{\mathfrak{Formulas \:of\: Chapter \:Probability\::-}}}$

• $\blue{\textsf{\underline{\underline{Experimental or Empirical Probability for an event P(E):-}}}}$

• $\boxed{\sf P(E) \: = \: \dfrac{Number \: of \: trails \: in \: which \: the \: event \: happened}{Total \: number \: of \: trails}}$

• $\green{\textsf{\underline{\underline{Theoretical or Classical Probability for an event P(T):-}}}}$

• $\boxed{\sf P(T) \: = \: \dfrac{Number \: of \: outcomes \: favourable \: to \: T}{Number \: of \: all \: possible \: outcomes \: of \: the \: experiment}}$

• $\purple{\textsf{\underline{\underline{Complementary Events:-}}}}$

• $\boxed{\sf P(E) \: + \: P(not \: E) \: = \: 1.}$

• $\pink{\textsf{\underline{\underline{Probability of an event lies between:-}}}}$

• $\boxed{\sf 0\: ≤\: P(E) \: ≤ \: 1.}$

• $\red{\textsf{\underline{\underline{Probability of a sure event = 1.}}}}$

• $\green{\textsf{\underline{\underline{Probability of a impossible event = 0.}}}}$

• $\blue{\textsf{\underline{\underline{Sum of probabilities of all the elementary events of a experiment = 1.}}}}$

Answer 2

Answer:

Required Answer :

Probability of experiments = Favourable event/No. of event that have been happened

Probability of classic = Numbers of outcomes favourable to E/No. of possible outcomes of the experiment.

P(E) = 1 - P(Ē)

0 ≤ P ≤ 1

~ Because the probability is greter than and always less than 1 or equal than 1

Probability of an impossible event = 0/Number of outcomes

If the probability is 100% sure than it will be 1.

More to Know :-

• Probability was invented by Blaise Pascal.
• It is derived from french word "Pierre de Fermat".
• Ronald fisher is known as father of probability