A company has 50 employees all working in the same building. As part of their safety procedures, a fire drill is carried out with the total number
of employees who have left the building recorded every 10 seconds.
The results are displayed in the cumulative frequency diagram below.
The company has the following
policy: "In the event of a fire, at least
90% of the employees must have
left the building within 1 minute."
Cumulative frequency
Did the fire drill procedure meet the
policy above?
You must show all your working.

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

On the first of each month sasha runs a 5k race she keeps track of her times to track her progress her time in minutes is recorded in the table

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10