PSTAT 2025/2026 Exam Questions with 100% Correct Answers | Latest Update

PSTAT 2025/2026 Exam Questions with
100% Correct Answers | Latest Update



P(A and B) - 🧠 ANSWER ✔✔P(A)xP(B)


P(A)xP(B|A)


P(A or B) - 🧠 ANSWER ✔✔P(A)+P(B)-P(A and B)


P(A|B) - 🧠 ANSWER ✔✔P(A and B)/P(B)


mean - 🧠 ANSWER ✔✔u=Σxp


variance - 🧠 ANSWER ✔✔o²=(Σx²p)-u²


standard deviation - 🧠 ANSWER ✔✔o=√o²


factorial - 🧠 ANSWER ✔✔n!=n(n-1)(n-2)(n-3)...


combination - 🧠 ANSWER ✔✔nCx=(n!)/(n-x)!x!


Binomial probability criteria - 🧠 ANSWER ✔✔1. there is a fixed number of

trials

2. these n trials are independent

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, 3. the outcome of each trial can be designated as a success or a failure

4. for each trial, the probability of a success if the same and is denoted by

p.


Binomial probabilities - 🧠 ANSWER ✔✔p(X=x)= nCx(p^x)(1-p)^n-x


Binomial distribution - 🧠 ANSWER ✔✔bin (n, p)




n: # of trials

p: probability of success


mean of binomial random variable - 🧠 ANSWER ✔✔µ=np


standard deviation of binomial random variable - 🧠 ANSWER ✔✔σ=√np(1-

p)


P(A' and B') - 🧠 ANSWER ✔✔1-p(A or B)


P(A'|B) - 🧠 ANSWER ✔✔1-P(A|B)


P(A' or B') - 🧠 ANSWER ✔✔1-P(A and B)


P(A and B') - 🧠 ANSWER ✔✔P(A)-P(A and B)




COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
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