Brainly a patient is sick with a certain infection where the treatment involves taking $20 drug that has a 90% chance of curing the infection. if that drug doesn't work, then the patient takes an $80 drug that is almost guaranteed to cure the infection. the table below displays the probability distribution of x= the total amount of money a randomly selected patient spends on this treatment plan.
x=total spent $20 $100
p(x) 90% 10%
given that μ x= $28 calculate σx
σx= ?
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