Assume that blood pressure readings are normally distributed with a mean of 115 and a standard deviation of 8. if 100 people are randomly selected, find the probability that their mean blood pressure will be less than 117. a) 0.8615 b) 0.9938 c) 0.8819 d) 0.0062 a coffee machine dispenses normally distributed amounts of coffee with a mean of 12 ounces and a standard deviation of standard deviation of 0.2 ounce. if a sample of 9 cups is selected, find the probability that the mean of the sample will be less than 12.1 ounces. find the probability if the sample is just 1 cup. a) 0.4332: 06915 b) 0.9332: 0.1915 c) 0.9332: 0.6915 d) 0.4332: 0.1915 if the sample size is multiplied by 4, what happens to the standard deviation of the distribution of sample means? a) the standard error is doubled. b) the standard error is decreased by a factor of 4. c) the standard error is increased by a factor of 4. d) the standard error is halved. find the probability that in 200 tosses of a fair six-sided die, a five will be obtained at least 40 times. a) 0.3875 b) 0.1210 c) 0.0871 d) 0.8810 match the binomial probability p(x < 40) with the correct statement a) p(there are at least 40 successes) b) p(there are fewer than 40 successes) c) p(there are at most 40 successes) d) p(there are more than 40 successes) ten percent of the population is left-handed. in a class of 100 students, write the binomial probability for the statement "there are more than 12 left-handed students in the class." a) p(x < 12) b) p(x > 12) c) p(x = 12) d) p(x lessthanorequalto 12)