Respuesta :
Answer:
If our random variable of interest for this case is X="the number of teenagers between 12-17 with smartphone" we can model the variable with this distribution:
[tex] X \sim Binom(n=234, p=0.75)[/tex]
And the mean for this case would be:
[tex] E(X) =np = 234*0.75= 175.5[/tex]
And the standard deviation would be given by:
[tex] \sigma =\sqrt{np(1-p)}= \sqrt{234*0.75*(1-0.75)}= 6.624[/tex]
Step-by-step explanation:
If our random variable of interest for this case is X="the number of teenagers between 12-17 with smartphone" we can model the variable with this distribution:
[tex] X \sim Binom(n=234, p=0.75)[/tex]
And the mean for this case would be:
[tex] E(X) =np = 234*0.75= 175.5[/tex]
And the standard deviation would be given by:
[tex] \sigma =\sqrt{np(1-p)}= \sqrt{234*0.75*(1-0.75)}= 6.624[/tex]
