Question

here is a stemplot of the high temperature readings in degrees fahrenheit for phoenix, arizona, for each day in july of a recent year.
8 | 4
8
9 | 3
9 | 7 9 9
10 | 0 1 1 2 2 3 4 4 4
10 | 5 5 6 6 6 7 7 8 8 9 9 9
11 | 0 1 1 3
11 | 5
(a) what percent of days in this month were hotter than 100 degrees fahrenheit (°f)? round to one decimal place.
%

Explanation:

Step1: Count total days

Count all data points:
$1 + 1 + 3 + 8 + 11 + 4 = 28$

Step2: Count days >100°F

Count values with stem 10 (≥101) + stem 11:
$11 + 4 = 15$

Step3: Calculate percentage

Divide count by total, multiply by 100:
$\frac{15}{28} \times 100 \approx 53.6$

Answer:

53.6%