A chemical engineer desiring to study the evaporation rate of water evaporation beds obtained data on the number of inches of evaporation in each of 55 July days spread over 4 years. The data are given in the following stem and leaf plot, which shows that the smallest data value was o.02 inch, and brine the largest o.56 inch. Stem Leaf 0.0 2, 6 0.1 1, 4 0.2 1, 1, 1, 3, 3, 4, 5, 5, 5, 6, 9 o, 0, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 5, 5, 6, 6, 7, 8, 9 0, 1, 2, 2, 2, 3, 4, 4, 4, 5, 5, 5, 7, 8, 8, 8, 9, 9 2, 5, 6 0.3 0.4 0.5 Find the: a) sample mean; b) sample median; c) sample standard deviation of these data. d) Do the data appear to be approximately normal? e) What percentage of data values are within 1 standard deviation of the mean?
A chemical engineer desiring to study the evaporation rate of water evaporation beds obtained data on the number of inches of evaporation in each of 55 July days spread over 4 years. The data are given in the following stem and leaf plot, which shows that the smallest data value was o.02 inch, and brine the largest o.56 inch. Stem Leaf 0.0 2, 6 0.1 1, 4 0.2 1, 1, 1, 3, 3, 4, 5, 5, 5, 6, 9 o, 0, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 5, 5, 6, 6, 7, 8, 9 0, 1, 2, 2, 2, 3, 4, 4, 4, 5, 5, 5, 7, 8, 8, 8, 9, 9 2, 5, 6 0.3 0.4 0.5 Find the: a) sample mean; b) sample median; c) sample standard deviation of these data. d) Do the data appear to be approximately normal? e) What percentage of data values are within 1 standard deviation of the mean?
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 94E
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A chemical engineer desiring to study the evaporation rate of water from brine
evaporation beds obtained data on the number of inches of evaporation in
each of 55 July days spread over 4 years. The data are given in the following
stem and leaf plot, which shows that the smallest data value was o.02 inch, and
the largest o.56 inch.
Stem
Leaf
0.0
2, 6
0.1
1, 4
1, 1, 1, 3, 3, 4, 5, 5, 5, 6, 9
0, 0, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 5, 5, 6, 6, 7, 8, 9
0, 1, 2, 2, 2, 3, 4, 4, 4, 5, 5, 5, 7, 8, 8, 8, 9, 9
2, 5, 6
0.2
0.3
0.4
0.5
Find the:
a) sample mean;
b) sample median;
c) sample standard deviation of these data.
d) Do the data appear to be approximately normal?
e) What percentage of data values are within 1 standard deviation of the
mean?
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