Practice Problems (3-4): Sampling Distribution

3. Students took a test in Physics and the final grades have a mean of 70 and a standard deviation of 10. If we can approximate the distribution of these grades by a normal distribution, what is the probability that a group of 5 students will pass the test (score 2 60)? 4. A population mean of 172 cm and a standard deviation of 10 cm. Find the probability that a group of 10 men will have a height ranging from 168 cm to 178 cm. assume height is normally distributed