The table below shows the heights of all fourth-grade students in a particular school, and the frequency of each height. Height 130 131 132 133 134 135 136 137 138 (cm) frequency 2 7 9 20 38 18 12 10 5 1. Is the given set of data approximately normally distributed? Why or why not? 2. What percentage of the students is shorter than 135 cm? (Show your solution) 3. How many fourth-grade students are represented in the data? (Show your solution) 4. What is the mean height of the given set of data? (Show your solution)
The table below shows the heights of all fourth-grade students in a particular school, and the frequency of each height. Height 130 131 132 133 134 135 136 137 138 (cm) frequency 2 7 9 20 38 18 12 10 5 1. Is the given set of data approximately normally distributed? Why or why not? 2. What percentage of the students is shorter than 135 cm? (Show your solution) 3. How many fourth-grade students are represented in the data? (Show your solution) 4. What is the mean height of the given set of data? (Show your solution)
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The table below shows the heights of all fourth-grade students in a particular school, and the frequency of each
height.
Height
130
131
132
133
134
135
136
137
138
(cm)
frequency
2
7
9
20
38
18
12
10
15
1. Is the given set of data approximately normally distributed? Why or why not?
2. What percentage of the students is shorter than 135 cm? (Show your solution)
3. How many fourth-grade students are represented in the data? (Show your solution)
4. What is the mean height of the given set of data? (Show your solution)
5. A radar unit is used to measure speeds of cars on a motorway. The speeds are rounded off to the nearest
whole number and are normally distributed with a mean of 90 km/hr and a standard deviation of 10
km/hr. What is the probability that the speed is between 70 km/hr and 80 km/hr inclusive? Show your
solution and shade the region under the curve that represents the probability.
6. The length of life of an instrument produced by a machine is rounded off to the nearest tenths and is
normally distributed with a mean of 12.2 months and standard deviation of 2.3 months. What is the
probability that an instrument produced by this machine will last less than 8.1 months? Show your
solution and shade the region under the curve that represents the probability.
For items 7-8: The Principal decided that the top 30% of the class with the highest grades in statistics will be
awarded. The scores are rounded off to the nearest hundredths and are approximately normally distributed with
a mean of 80.51 and a standard deviation of 10.2.
7. What is the minimum score that a student should have to be awarded? Show your solution and shade the
region under the curve that represents the portion of the population involved in the situation.
8. If 1500 students took the test, how many will NOT be awarded?
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The Principal decided that the top 30% of the class with the highest grades in statistics will be awarded. The scores are rounded off to the nearest hundredths and are approximately
What is the minimum score that a student should have to be awarded? Show your solution and shade the region under the curve that represents the portion of the population involved in the situation.
Solution
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