Calculate the rms value of the given wave

• A. <table><tr> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> 15</center> </td><td rowspan="2">A </td></tr><td align="center">10</td></table>
• B. <table><tr> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> 5</center> </td><td rowspan="2">A </td></tr><td align="center">12</td></table>
• C. <table><tr> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> 15</center> </td><td rowspan="2">A </td></tr><td align="center">9</td></table>
• D.
• E. <table><tr> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> 12</center> </td><td rowspan="2">A </td></tr><td align="center">15</td></table>