a-certain-stocks-daily-percent-return-on-fridays-has-a-mean-of-312312-and-a-stan-d093ff33

Question

A certain stock's daily percent return on Fridays has a mean of $3.12 percent sign$ and a standard deviation of $41.25 percent sign$ . If random samples of $40$ days are selected and the mean return for each sample is calculated, what is the probability that a sample mean is between $negative 5 percent sign$ and $10 percent sign$ ?

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Answer

A certain stock's daily percent return on Fridays has a mean of 3.12%3.12\% and a standard deviation of 41.25%41.25\%. If random samples of 4040 days are selected and the mean return for each sample is calculated, what is the probability that a sample mean is between −5%-5\% and 10%10\%?