The number of chocolate chips in a bag of chocolate chip cookies is approximatel

Question

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with mean 1262 and a standand (a) Determine the 30th percentile for the number of chocolate chips in a bag (b) Determine the number of chocolate chips in a bag that make up the middle 95% of bags (c) What is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies? Click here to view the standard normal distribution table (page 1) Click here to view the standard normal distribution table (page 2). or 118 (a) The 30th percentile for the number of chocolate chips in a bag of chocolate chip cookies is chocolate chips (Round to the nearest whole number as needed) (b)The number of chocolate chips in a bag that make up the middle 95% of bags is (Round to the nearest whole number as needed. Use ascending order) to chocolate chips. (c) The interquartile range of the number of chocolate chips is (Round to the nearest whole number as needed.)

Explanation / Answer

a) Use Excelfunction

NORMSINV(0.30)*118+1262

=1200

b)Lower bound = 1262-2*118 = 1026

Upper bound = 1262+2*118 = 1498

c) IQR =Q3-Q1

= NORMSINV(0.75)*118+1262-(NORMSINV(0.25)*118+1262)

= 159

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