6. For the 2015 holiday season, a nation-wide survey estimated that parents spent an average of $422 per child on holiday gifts, with 2.5% of parents spending more than $442 and 2.5% of parents spending less than $402. The distribution is known to be normally distributed. What is the approximate standard deviation of this distribution? (hint: think 68-95-99.7 rule).

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6. For the 2015 holiday season, a nation-wide
survey estimated that parents spent an
average of $422 per child on holiday gifts,
with 2.5% of parents spending more than
$442 and 2.5% of parents spending less than
$402. The distribution is known to be
normally distributed. What is the approximate
standard deviation of this distribution? (hint:
think 68-95-99.7 rule).
Transcribed Image Text:6. For the 2015 holiday season, a nation-wide survey estimated that parents spent an average of $422 per child on holiday gifts, with 2.5% of parents spending more than $442 and 2.5% of parents spending less than $402. The distribution is known to be normally distributed. What is the approximate standard deviation of this distribution? (hint: think 68-95-99.7 rule).
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