Description of probabilities and statistics

Reference no: EM13101724

1. Let f(x) = 2e^(-(x-3)/c), 3 < x < infinity (zero otherwise) be a p.d.f. of a random variable X.

a. Find c

b. Find the CDF of X and sketch the CDF

c. Compute P(-5 < X < 10)

2. A candy maker produces mints that have a label weight of 30 grams. Assume that the distribution of the weights of these mints is N(30, 2^2).

a. Let X be the weight of a single mint selected at random from the production line. Find P(X > 32).

b. Suppose that 20 minutes are selected independently and weighted. Let Y equal the number of these mints that weigh less than 30 grams. Then find P(Y = 3).

c. Now, suppose that n = 100 mints are selected independently and weighted. Let Y equal the number of these mints that weigh less than 30 grams. Find the probability P(20 < Y <= 30) approximately. (Hint: Use CLT)

Reference no: EM13101724

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