Shift 2: 18 25 56 42 29 38 54 47 35 30. shift 2: 23 19 50 49 67 34 30 59 40 33. shift 3: 19 22 24 40 45 29 33 29 39 59. shift 4: 21 23 25 40 35 19 70 40 22 23.    the summary statistics for all of the workers at a steel factory are shown. four sample groups were taken from each of the four shifts. for which sample group is the mean closest to the population mean?

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

step-by-step explanation:

for the free