PLEASE HELP The left-hand "tail of the standard normal curve can be defined as the part
that lies at least 2 standard deviations to the left of the mean.
According to the empirical rule, approximately what percentage of the area
under the whole curve is in the left-hand tail? Round your answer to the
nearest tenth.

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss