Suppose a research firm conducted a survey to determine the average amount of money steady smokers spend on cigarettes during a week. a sample of 100 steady smokers revealed that the sample mean is $20 and the sample standard deviation is $5. what is the probability that a sample of 100 steady smokers spend between $19 and $21?
answer
0.4772
0.0228
0.9544
$20

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).

Given that abcd is a rhombus, what is the value of x?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16