The left-hand "tail" of the standard normal curve can be defined as the part of it that lies at least two 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 perimeter of a rectangle is greater than or equal to 74 meters. if the length is 25 meters, the minimum width of the rectangle is meters.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

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