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Introduction to Using Data Sets Practice Test
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Q1
A store tracks weekly sales in an int[] and uses totals for restocking decisions. Consider:
In a small bookstore, the manager records the number of mystery novels sold each day for a week to decide how many to reorder. The data set is a fixed-size array because there are always 7 days in a week, and each index represents a day (0 = Monday, 6 = Sunday). By summing the array, the manager estimates demand; by computing an average, the manager decides whether to increase next week’s order. If a late receipt changes Tuesday’s count, the array value must be updated before recalculating totals.
int[] dailySales = {12, 9, 15, 8, 11, 14, 10};
int total = 0;
for (int i = 0; i < dailySales.length; i++) {
total += dailySales<u>i</u>; // add each day
}
double avg = (double) total / dailySales.length;
Refer to the problem scenario in the passage, what is the value of avg after the code executes?
A store tracks weekly sales in an int[] and uses totals for restocking decisions. Consider:
In a small bookstore, the manager records the number of mystery novels sold each day for a week to decide how many to reorder. The data set is a fixed-size array because there are always 7 days in a week, and each index represents a day (0 = Monday, 6 = Sunday). By summing the array, the manager estimates demand; by computing an average, the manager decides whether to increase next week’s order. If a late receipt changes Tuesday’s count, the array value must be updated before recalculating totals.
int[] dailySales = {12, 9, 15, 8, 11, 14, 10};
int total = 0;
for (int i = 0; i < dailySales.length; i++) {
total += dailySales<u>i</u>; // add each day
}
double avg = (double) total / dailySales.length;
Refer to the problem scenario in the passage, what is the value of avg after the code executes?