Question

Plzzzzzzzzzz help
Toni measured the height of her bedroom doorway with a measuring tape. She measured the height as 171 cm. The doorway’s actual height is 182.8 cm.

What is the percent error in Toni’s measurement? Round to the nearest tenth of a percent, if necessary.

A.
0.12%

B.
6.5%

C.
6.9%

D.
11.8%

Answer 1

-- The height of the doorway is really  182.8 cm.

-- Tamara measured  171 cm.

-- That was not exactly right. 
    She was off by  (182.8 - 171) =  11.8 cm .

-- Compared to the real true number,
    the error was
                           (11.8 / 182.8) = 0.0646 of it .

-- To change a decimal to percent,
   move the decimal point two places that way ==> .

                  0.0646  =  6.46%

   Rounded to the nearest tenth of a percent,

                                   6.46%  ==>  6.5% .

Her error should really be called  -6.5% , because
her measurement was too low.