Which statement must be true? O Each distribution has the same mean and the samne standard deviation.
O Each distribution has the same mnean and a different standard deviation.
O Each distribution has a different mnean and the same standard deviation
O Each distribution has a different mean and a different standard deviation

The radical equation 2+√2x-3 = √x+7 has a solution set [x= a0} and an extraneous root x = a1.

How do you find principle and simple interest

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