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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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.)
Transcribed Image Text: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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