The upper quartile is $20.58, and 25% of all days the stock is above $13.41.
To solve this problem
We take 75% of the range (because the upper quartile corresponds to the 75th percentile).
Let calculate it: $9.82 + ($24.17 - $9.82) * 0.75.
Simplify: $9.82 + $14.35 * 0.75.
Therefore. The upper quartile is $20.5825, but round it to the nearest cent: $20.58.
To find the value above which 25% of all days the stock is, we calculate the 25th percentile.
Use the formula: $9.82 + ($24.17 - $9.82) * 0.25.
Simplify: $9.82 + $14.35 * 0.25.
So, The result is $13.4075, but round it to the nearest cent: $13.41.
Therefore, the upper quartile is $20.58, and 25% of all days the stock is above $13.41.