selection day

What is the probability that a day selected in a week starts with letter 'S'? => 3 7 or one or 2 7 or 1 7..

What is the probability that a month selected from a year will have 31 days? => 1 or 1 3 or 1 2 or 7 12..

What is the probability that a month selected from a year will have less than 31 days? => 1 2 or 7 12 or 5 12 or 1..

What is the probability that a month selected from a year will have atleast 28 days? => Either zero or 1 12 or 1 12 or one or zero..

In a survey, it was found that 20% of the people smoke more than 3 packs of cigarettes a day. If 8 people are selected at random, then find the probability that exactly 5 people smoke more than 3 packs. => 0.009 or 0.2 or 0.09 or 0.125..

90 primary school children out of 100 randomly selected, view television on an average day. Test the hypothesis that more than 83% of the primary school children view television on an average day. Use α = 0.05 level of significance. => z = 1.86, there is enough e..

A mail order firm professional wishes to estimate the average time taken to deliver the packet(s). How large a sample must she select if she desires to be 90% confident that the true mean is within 3 days of sample mean? The standard deviation of the delivery of packets is known..

A paediatric hospital presents data on the number of children and their stay in the hospital for their postnatal care during March 2005 as a frequency distribution: Days Number of children 0 - 4 25 5 - 9 11 10 - 14 10 15 - up 4 What is the probability that a child selected at ra..

The average time a person spoke over the cell phone while driving in a day was reported as more than 14.5 minutes. A researcher wished to test this report. He selected a sample of 100 persons for his study and found that the mean was 15.6 minutes. At α = 0.01, what will be..

Select each of the following as nominal (N), ordinal (O), interval (I), ratio level (R). I. Classification of residents according to zip codes. II. The number of phone calls received on a particular day in an organization. III. Grades of students in a school final exam. IV. IQ l..