You have a normal distribution of hours per week that music students practice. The mean of the values is 8 and the standard deviation of the values is 4.
According to the normal distribution model that corresponds to this population, what percentage of the students
practice between 6 to 10 hours per week?
Use the graph of the standard normal distribution given below to find the percentage.
Standard Normal
Distribution
"Bell Curve
onnen 10 SOUND
3-2.5 -2 -15 +1 -0.50 -0.5 +1 +1.5 -2.25 -3
2019
38%
34%
19%
303

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step-by-step explanation:

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the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places