Which of the following does NOT describe a standard normal curve?

A)Symmetrical
B)Centered about the mean
C)95% of the data falls within 3 standard deviations of the mean
D)8% of the data falls within 1 standard deviation of the mean
E)Bell shaped

The description which is not applicable to a standard normal distribution or curve from the options given are

A standard normal curve is also described as the area under a normal distribution curve.

Normal distributions a mean of 0 and standard deviation of 1. Hence, they are centered about the mean.

Since they are centered about the mean, they produce a symmetrical distribution which are described as being bell shaped.

68%, 95% and 99.7% of the data falls within 1, 2 and 3 standard deviation of the mean respectively.

Therefore, options C and D does not describe a standard normal curve.

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C

Step-by-step explanation:

Normal curves are symmetrical, bell shaped, and centered about the mean.

According to the empirical rule, 68% is within 1 standard deviation, 95% is within 2 standard deviations, and 99.7% is within 3 standard deviations.

x=half

step-by-step explanation:

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1