Answer: Average of her phone bill was $80.
Step-by-Step Explanation:
Since we have given that
Maria's phone bills were
[tex]\$95,\$67,\$43,\ and\ \$115.[/tex]
Average of her phone bills were given by
[tex]Mean=\frac{\text{ Sum of total observation}}{\text{Number of observation}}\\\\Mean=\frac{95+67+43+115}{4}\\\\Mean=\frac{320}{4}\\\\Mean=\$80[/tex]
Hence, Average of her phone bill was $80.