Apparently these questions are missing something from the work, I can't seem to find it, I don't know what I am missing. I need help, please!

Question 1 1 pts What is the probability that a z-score is more than -1.6 (Rounded to four decimal places]? Question 2 1 pts What is the probability that a z-score is less than -0.87? {Report answer with four digits after the decimal: include leading zero in answer: 0.####] Question 3 1 pts If IQ scores are normally distributed with a mean of 100 and a standard deviation of 9, what is the mean IQ score after the scores have been standardized by converting them to z-scores? Question 4 1 pts The below graph is a Normal distribution. If the vertical line represents a z-score of 0.71, what is the proportion of the observations that would occur in the shaded area? (Report answer with four digits after the decimal; include leading zero in answer: 0.####) Question 5 1 pts Assuming that hours worked (for pay) per week among on-campus college students is Normally distributed with a mean of 14.9 hours and a standard deviation of 3.8 hours, what percentage of college students work more than 20 hours per week? Do NOT include the percent sign with your answer - just the value rounded to the hundredths (two digits after decimal). Question 6 1 pts If a variable's distribution is skewed (either positively or negatively), but we had random sample of more than 500 cases (N>500), would we be able to standardize the values of that variable's distribution to the standard Normal (z) distribution in order to find the proportion of cases above/below/between various points? Why or why not? (Be sure to explain your reasoning clearly and to demonstrate your understanding of what the Law of Large Numbers and Central Limit Theorems tell us!)