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2 Statistics

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Question 167

A pharmaceutical lab fills vials with a reagent. The volume of reagent in a vial, VVV ml, is modeled by a normal distribution with mean 125.2125.2125.2 ml and standard deviation 0.850.850.85 ml.

a.

Determine the probability that the volumes of reagent in two randomly chosen vials differ by more than 2.02.02.0 ml.

[4]
b.

Vials are transported in batches of 15 using a specialized storage rack. The volume of the storage rack itself, RRR ml, is modeled by a normal distribution with mean 320.0320.0320.0 ml and standard deviation 2.52.52.5 ml.

Calculate the probability that the total volume of a randomly selected storage rack fully loaded with 15 vials exceeds 220522052205 ml.

[5]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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