Yes, you can easily change it,,
Step 1: Simply go to the iforgot.apple.com and enter your Apple ID, then click on the Continue.
Step 2: Select the option to reset your security questions, and then clink on the Continue.
Step 3: After it enter your Apple ID password, then click on Continue.
After entering your Apple ID simply follow the onscreen steps to verify your identity.
It will ask you to select a new security questions and answers, enter the question and answer and then click on the Continue.