#Jelly, 9 8 7 bytes

From 8 to 7 thanks to @FryAmTheEggman.

+2X’¤¡€ 

Try it online!

###Explanation

+2X’¤¡€ € Map over each argument... 2X Choose a random number from {1,2} ’ Minus 1 ¤ (grammar stuff) ¡ Repeat that number of times... + Add the second input (to the argument being mapped over). 

Jelly, 9 8 7 bytes

From 8 to 7 thanks to @FryAmTheEggman.

+2X’¤¡€ 

Try it online!

Explanation

+2X’¤¡€ € Map over each argument... 2X Choose a random number from {1,2} ’ Minus 1 ¤ (grammar stuff) ¡ Repeat that number of times... + Add the second input (to the argument being mapped over). 

#Jelly, 9 8 7 bytes

From 8 to 7 thanks to @FryAmTheEggman.

+2X’¤¡€ 

Try it online!

###Explanation

+2X’¤¡€ € Map over each argument... 2X Choose a random number from {1,2} ’ Minus 1 ¤ (grammar stuff) ¡ Repeat that number of times... + Add the second input (to the argument being mapped over). 

#Jelly, 9 8 7 bytes

From 8 to 7 thanks to @FryAmTheEggman.

+2X’¤¡€ 

Try it online!

###Explanation

+2X’¤¡€ € Map over each argument... 2X Choose a random number from {1,2} ’ Minus 1 ¤ (grammar stuff) ¡ Repeat that number of times... + Add the second input (to the argument being mapped over). 

#Jelly, 9 8 7 bytes

From 8 to 7 thanks to @FryAmTheEggman.

+2X’¤¡€ 

Try it online!

#Jelly, 9 8 7 bytes

From 8 to 7 thanks to @FryAmTheEggman.

+2X’¤¡€ 

Try it online!

###Explanation

+2X’¤¡€ € Map over each argument... 2X Choose a random number from {1,2} ’ Minus 1 ¤ (grammar stuff) ¡ Repeat that number of times... + Add the second input (to the argument being mapped over).