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Hi Please help me to solve this question.It's Gmat prep Test question based on Range

Hi Please help me to solve this question.It's Gmat prep Test question based on Geometry [ATTACH]5553[/ATTACH]

Hi Please help me to solve this question.It's Gmat prep Test question based on Range [ATTACH]5552[/ATTACH]

Thanks Lock once again....I understand the solution....If you have any theory or notes related to standard deviation problems...then could you please provide them

Thanks Lock.. I have one more question for you...please try to resolve this one also. Question: The resident of town X participated in a survey to determine the number of hours per week each resident spent watching telivision.The Distribution of the result of the survey had a mean of 21 hour and a std deviation of 6 hr.The number of hour that PAT, a resident of town X watched telivision last week was between 1 and 2 standard deviation below the mean. Which of the following could be the number of hours that PAT watched television last week? a) 30 b) 20 c) 18 d) 12 e) 6

Hi I am stucked on this question while writing test of GMAT Prep.This question is related to Standered Deviation. Help Me to resolve this question and please explain the method also Question : 9.4 9.9 9.9 9.9 10.0 10.2 10.2 10.5 The Mean and standard deviation of 8 numbers shown are 10.0 and 0.3 , repectively .what percentage of the 8 numbers are within 1 standard deviation of the mean a)90% b)85 c)80 d)75 e) 70