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```#include <iostream>
#include <vector>
#include <iomanip>
#include <cmath>
#include <sstream>

int main() {
double sum = 0.0;

std::cout << "Enter 6 voltage readings: ";
for (int i = 0; i < numReadings; ++i) {
std::cin >> voltages[i];
sum += voltages[i];
}

// Calculate average voltage
double average = sum / numReadings;
double tenPercent = average * 0.10;
double fifteenPercent = average * 0.15;

// Display average voltage
std::cout << std::fixed << std::setprecision(1);
std::cout << "The average is " << average << " volts." << std::endl;
std::cout << "10% = " << tenPercent << " volts." << std::endl;
std::cout << "15% = " << fifteenPercent << " volts." << std::endl;

// Check for anomalies
std::ostringstream problems;

for (int i = 0; i < numReadings - 1; ++i) {
float voltage_check = std::abs(voltages[i] - average);
if (voltage_check > tenPercent) {
problems << "The voltage at hour " <<  i + 1 << " was " << voltages[i]
<< " volts (difference of " << voltage_check << " volts)." << std::endl;
}
}

for (int i = 0; i < numReadings - 1; ++i) {
float voltage_check = std::abs(voltages[i + 1] - voltages[i]);
if (voltage_check > fifteenPercent) {
problems << "Voltage change from hour " << i + 1 << " to hour " << i + 2
<< " was " << voltage_check << " volts." << std::endl;
}
}

if (problems.str().empty()) {
std::cout << "No problems were encountered." << std::endl;
}
else {
std::cout << "The following problems occured:" << std::endl << problems.str();
}

return 0;
}
```