Your company is trying to optimize the battery for a new product, and your team has been investigating the recharge cycle. You want to make sure that the battery does not overheat during recharge. You keep track of the temperature of the battery as it charges. Your data is displayed in the relative cumulative frequency chart below.

84868890929496980.050.10.150.20.250.30.350.40.450.50.550.60.650.70.750.80.850.90.951Battery Temperature (Degrees F)Relative Cumulative Frequency

(a) Estimate the proportion of batteries that charged with a temperature of 88 degrees or less.  (Enter your answer as a decimal between 0 and 1)

 

(b) Estimate the proportion of batteries that charged with a temperature above 92 degrees. (Enter your answer as a decimal between 0 and 1)

(c) What battery temperature represents the 65th percentile?

 °F

(d) Which temperature range did the highest number of battery recharges in it?

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