Mathematics: Can t find probability

Can t find probability - id13486609, giovannymarvez16

jesh0975556

25.06.2021

$0.0756,\ 0.7599$

Step-by-step explanation:

Given

Probability that a coin will land head is 0.3 i.e. probability of success is p=0.3 So, the probability of failure is q=1-0.3=0.7

Using Binomial distribution for n=4

(a) Probability that the coin will lead heads exactly 3 times

$\Rightarrow P(3)=^4C_3(0.3)^3(0.7)^1\\\Rightarrow P(3)=4\times 0.7\times (0.3)^3\\\Rightarrow P(3)=0.0756$

(b)Probability that the coin lands head at least once

$\Rightarrow 1-P(0)\\\Rightarrow 1-^4C_0(0.3)^0(0.7)^4\\\Rightarrow 1-1\cdot(0.7)^4\\\Rightarrow 0.7599$

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jacamron

29.09.2020

Hello!

(6a/8+3) + 7a/8 =

= 6a/11 + 7a/8 =

= 125/88 × a

Good luck! :)

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