An engineer wishes to determine the width of a particular electronic component. if she knows that the standard deviation is 3.3 mm, how many of these components should she consider to be 95% sure of knowing the mean will be within ± 0.3mm?

- 328

- 5062

- 465

- 33

- 22

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

for the free

< < < emily> > >

step-by-step explanation:

the answer is 89 d

i took the test

it would be 3 ÷by 6 because the number on each side