Percentage
A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.
Algebraic Expressions
In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.
Numbers
Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.
Subtraction
Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.
Addition
Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.
![mode.
bove Ao the means and standard deviations for the heights of 6- and 14-year-old
Age
Mean
Standard deviation
45.8 in.
1.4
14
64.3 in.
2.8
a. Which boy is taller for his age?
D. If there are 11 other boys in the 6-year-old's class at school, how many of them
would you expect to be taller than he is?
12. Antonio's height is 1 standard deviation below the mean for boys his age. If the
heights of boys are normally distributed, at what percentile is Antonio's height? (What
percent of the boys his age are as short or shorter than Antonio?)
13. Suppose a student had a z-score of -0.3 on a standardized exam. Would you consider
this a passing or failing score? Why?
14. Suppose you gave your students a test and converted their scores into z-scores. Could
you tell from just the z-scores how well your class did on the test? Why or why not?
15. What are the advantages of converting raw scores to z-scores? What are the
disadvantages of converting to z-scores? Is any information lost?
16, Consider the graphs of three normal
distributions, P, Q, and R, on the same](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F94101402-60d8-45a8-8ca3-81b0c3d92653%2F20d12b23-502f-454a-817c-05fb9146543c%2Fsfjogt_processed.jpeg&w=3840&q=75)
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