Can somebody help me please? The probability that a certain state will be hit by a major tornado (category F4 or F5) in any single year is 1/20 Complete parts (a) through (d) below.

a. What is the probability that the state will be hit by a major tornado two years in a row? (Simplify your answer. Round to five decimal places as needed)

b. What is the probability that the state will be hit by a major tornado in three consecutive years? (Simplify your answer. Round to five decimal places as needed)

c. What is the probability that the state will not be hit by a major tornado in the next ten years? (Round to three decimal places as needed)

d. What is the probability that the state will be hit by a major tornado at least once in the next ten years? (Round to three decimal places as needed)

According to a research study, parents with young children slept 6.4 hours each night last year, on average. a random sample of 18 parents with young children was surveyed and the mean amount of time per night each parent slept was 6.8. this data has a sample standard deviation of 0.9. (assume that the scores are normally distributed.) researchers conduct a one-mean hypothesis at the 5% significance level, to test if the mean amount of time parents with young children sleep per night is greater than the mean amount of time last year. the null and alternative hypotheses are h0: μ=6.4 and ha: μ> 6.4, which is a right-tailed test. the test statistic is determined to be t0=1.89 using the partial t-table below, determine the critical value(s). if there is only one critical value, leave the second answer box blank.