Suppose the mean blood pressure for people in a certain country is 126 mmHg with a standard deviation of 24 mmHg. Blood pressure is normally distributed. State the random variable. The standard deviation of blood pressures of people in the country. The blood pressure of a person in the country. The mean blood pressure of people in the country. Suppose a sample of size 15 is taken. State the shape of the distribution of the sample mean. The sampling distribution of the sample mean is unknown since the sample size is less than 30. The sampling distribution of the sample mean is normally distributed since the population is normally distributed. The shape of the sampling distribution of the sample mean is unknown since the population of the random variable is normally distributed and the sample size is less than 30. Suppose a sample of size 15 is taken. State the mean of the sample mean. Suppose a sample of size 15 is taken. State the standard deviation of the sample mean. Round to two decimal places. x = Suppose a sample of size 15 is taken. Find the probability that the sample mean blood pressure is more than 136 mmHg