Given an approximately normal distribution what percentage of all values are within 1 standard deviation from the mean?
100%
98%
70%
68%

68%

Step-by-step explanation:

By the empirical rule, for an approximately normal distribution, about 68% of all values are within one standard deviation from the mean. Refer to the normal distribution bell curve.

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

b

step-by-step explanation:

i dont know