Q1: I'm fishing. The probability of catching a fish on each cast of my rod (each attempt) is 0.23. Each attempt is independent. If I wanted to find the probability that my first catch is on my 4th attempt, is this a geometric or binomial situation? PDF or CDF situation? Find the probability:

Q2: I'm fishing. The probability of catching a fish on each cast of my rod (each attempt) is 0.23. Each attempt is independent. If I made 12 attempts and wanted to find the probability that I caught 2 or fewer fish, is this a geometric or binomial situation? PDF or CDF situation? Find the probability:*

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Q1: What effect would multiplying a random variable by 5 have on its expected value and standard deviation?

Q2: When we subtract random variables, why do we add their variances?