7.CE.27 Question Help v The daily exchange rates for the five-year period 2003 to 2008 between currency A and currency B are well modeled by a normal distribution with mean 1.992 in currency A (to currency B) and standard deviation 0.044 in currency A. Given this model, and using the 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely, complete parts (a) through (d). a) What is the probability that on a randomly selected day during this period, a unit of currency B was worth less than 1.992 units of currency A? The probability is 50 %. (Type an integer or a decimal.) b) What is the probability that on a randomly selected day during this period, a unit of currency B was worth less than 1.860 units of currency A? The probability is 0.15%. (Type an integer or a decimal.) c) What is the probability that on a randomly selected day during this period, a unit of currency B was worth more than 2.080 units of currency A? The probability is 0.01 %. (Type an integer or a decimal.)

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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.