The length of a social media interaction is normally distributed with a mean of 3 minutes and a standard deviation of 0.4 minutes. what is the probability that an interaction lasts longer than 4 minutes?

Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e.g. 98.76543).

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Find two numbers if their sum is 91 and the ratio is 6: 7?