2 - x < 1 . 1 1 x < 2 . 6 2 x...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
STATISTICS 401.3 QUIZ # 2 Fall 2005 NAME: ID: —————————- 1 The following 20 numbers are the measurement of the volumes in cm 3 of 20 cylinders randomly selected from a manufacturing line. Note that the numbers have been sorted. 3.07 3.75 4.10 4.26 4.29 4.31 4.33 4.34 4.36 4.44 4.49 4.50 4.53 4.55 4.56 4.60 4.61 4.62 4.65 4.79 1. (2 points) Make a stem and leaf diagram and discuss the shape of the distribution of these volumes. [Use only the last digit as leaf.] 2. (2 points) Find the 25th, 50th and 75th percentiles for these data. 3. (2 points) Construct a box plot. 4. (2 points) Are there any mild or extreme outliers? 2 Let X denote the daily sales for a computer manufacturing firm. The cumulative distribution function of the random variable X is F ( x ) =
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: x < 1 . 1 1 x < 2 . 6 2 x < 3 . 8 3 x < 4 1 4 x 1 1. (2 points) Write down the probability mass function of X . 2. (2 points) Calculate the expected value and variance of X . 3. (2 points) Suppose the rm makes an average of $900 per sale. Thus Y = 900 X is the expected revenue per day in dollars. Find the mean value and variance of Y . 3 Let X denote the resistance of a randomly chosen resistor, and suppose that its pdf is given by f ( x ) = kx if 5 x 8 otherwise 1. (2 points) Find k . 2. (2 points) Find the mean value and variance of X . 3. (2 points) Give a formula for the cdf of X . 4. (2 points) Find the 25th percentile of X . 2...
View Full Document

Page1 / 2

2 - x < 1 . 1 1 x < 2 . 6 2 x...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online