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 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 Frequency

Your data is also displayed in the cumulative relative 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 90 degrees or less.  (Enter your answer as a decimal)

 

(b) Estimate the proportion of batteries that charged with a temperature of 88 degrees.  (Enter your answer as a decimal)

 

(c) Estimate the proportion of batteries that charged with a temperature above 94 degrees. (Enter your answer as a decimal)

(d) What battery temperature represents the 55th percentile?

 °F

(e) In which temperature range did the highest percentage of battery recharges occur?

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