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The calculator is recalling the wrong value for a value in the memory
You must clear the memory before placing a new value in the memory. The clear
function is the second function on 9. Press SHIFT 9 then follow the
instructions on the screen.
The calculator is frozen
In the middle of the back of the calculator there is a small hole. Press in the middle
of the hole with a fine tipped biro.
In statistics the calculator is pasting the value of the mean in place of a
score in the data list.
You haven‛t pressed C to indicate that you have finished entering the scores. The
calculator is treating the mean as a score.