Question

For a normal curve, what percentage of values falls within two standard deviations of the mean?

95%

34%

68%

50%

Answer 1

@Michele_Laino

Answer 2

we have to use the table of the erf function. Using that table, you should get this:
p=95.45%

Answer 3

4.4% + 9.2% + 15.0% + 19.1% + 19.1% + 15.0% + 9.2% + 4.4% = 95.4%

Answer 4

thanks!

Answer 5

ok!

Answer 6

thanks!