Respuesta :

The correct answer is z=-1.49.

Explanation:

We use a z-table to find the answer.  Instead of looking at the values to the left of the table, which show us the z-score, we look in the center to find the area to the left of the z-score in the curve.  We know we want 6.8% of the data to fall to the left of the score; 6.8% = 6.8/100 = 0.068.  In the center cells of the table, the z-score that is closest to this score is -1.49.

Answer with explanation:

it is given that ,6.8% of standard normal curve lies to left of z.

6.8% [tex]=\frac{6.8}{100}\\\\=0.068[/tex]

We will use z table to calculate the value of z.

First we will go on y axis in z table to see value of 0.06 and then on 0.08 on x axis.Their point of intersection will give value of z at 0.068, which is equal to 0.2483.

Value of Z ,at 6.8% ,when the curve is normal = 0.25

⇒0.25 represents area in the left of ,z=0.068.

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