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Help with probability questions!?

If anyone could help me with any of these questions I'd really appreciate it! 1)Statistics Canada reported that 76% of families in Edmonton consist of married couples. There are 22 students in a grade 3 class. The school administration records whether they live with both biological parents who are either married or living common-law. If the child is from a single-parent home, they record the parent with which the child lives. a) What is the probabilty that exactly half the students have families where the parents are defined as a married couple? Express your answer to the nearest tenth of a percent. b) What is the probabilty that at least one student does not have parents that are defined as a married couple? 2) Krina works in a call centre assisting home-computer users. THe average length of a call in her centre is 605 s. Her last call took only 569 s.Her manager offers a bonus for calls that are handled efficiently and quickly. If a call is handled more quickly than 95% of calls, a 2$ bonus is paid. What is the largest standard deviation for the calls that would let Krina's latest call get the bonus? Round your answer to 2 decimal places if needed. 3) The scores for a particular examination are normally distributed with a mean of 54.8% and a standard deviation of 16.3%. What is the probabilty that a student who wrote the exam had a mark of 75% or more? Round to 4 decimals if needed. 4) A teacher the lung capacity of students in her school. She found that the values were normally distributed with a mean of 3500 mL and a standard deviation of 300 mL. If 23% of the kids had lung capacities that were less than Samantha's, what is Samantha's lung capacity? Round to nearest millilitre. 5) A teacher marking an assignment gave the following marks: 49, 90, 87, 68, 61, 71, 53, 65, 79, 88 What is the z-score corresponding to the lowest mark? Round to 3 decimal places.

Public Comments

1. I will not just do your homework.