Assume that a procedure yields a binomial distribution with n=1421 trials and the probability of success for one trial is p=1/4. Find the mean for this binomial distribution. μ=  Find the standard deviation for this distribution.

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Assume that a procedure yields a binomial distribution with n=1421 trials and the probability of success for one trial is p=1/4.

Find the mean for this binomial distribution.


μ= 

Find the standard deviation for this distribution.

σ= 

Use the range rule of thumb to find the minimum usual value μ–2σ and the maximum usual value μ+2σ.
Enter answer as an interval using square brackets only with whole numbers.
usual values = 
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