According to the WHO MONICA Project the mean blood pressure for people in China is 128 mmHg with a standard deviation of 23 mmHg (Kuulasmaa, Hense & Tolonen, 1998).Blood pressure is normally distributed.

1. State the random variable.

Blood pressure for people in China

1. Suppose a sample of size 15 is taken.State the shape of the distribution of the sample mean.
2. Suppose a sample of size 15 is taken.State the mean of the sample mean.

mean of the sample mean is 128 mmHg

1. Suppose a sample of size 15 is taken.State the standard deviation of the sample mean.

Standard deviation is 23/15 = 7.725

1. Suppose a sample of size 15 is taken.Find the probability that the sample mean blood pressure is more than 135 mmHg.

From calculator normalcdf(135,1e99,128,7.725) = 0.1824

1. Would it be unusual to find a sample mean of 15 people in China of more than 135 mmHg?Why or why not? yes because according to question f. the probability is very small or the sample is very small.
2. If you did find a sample mean for 15 people in China to be more than 135 mmHg, what might you conclude?

I need help with the ones in bold please