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1. In a memo to all those involved in tax preparation, the IRS indicated that the...

1. In a memo to all those involved in tax preparation, the IRS indicated that the mean amount of refund was $2000 with a standard deviation of $400. Assume the distribution or the amounts returned follows the NORMAL distribution. Percent of refunds from $2000 to $3200, What percent of refunds were between 2000 and 3200?

2. In a memo to all those involved in tax preparation, the IRS indicated that the mean amount of refund was $2000 with a standard deviation of $400. Assume the distribution or the amounts returned follows the NORMAL distribution.

Top 20% Value.  

What is the Z value for the top 20 percent?

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