Question 1087151
The {{{mean}}} of the {{{sampling}}}{{{ distribution}}} of the mean is the {{{mean}}} of the {{{population}}} from which the scores were sampled. 
Therefore, if a population has a mean {{{mu}}}, then the mean of the sampling distribution of the mean is also {{{mu}}}. The symbol {{{mu*M}}} is used to refer to the mean of the sampling distribution of the mean. 
Therefore, the formula for the mean of the sampling distribution of the mean can be written as:

{{{mu*M=mu}}}

so, your answer is A. {{{10}}}