A bike helmet which usually costs $57 is discounted 20%. About how much is the discount amount?
1 answer:
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Answer: 0.3439
Step-by-step explanation:
Total number of digits : 10
The number of digits except zero =9
The probability of selecting non-zero number :-
Then, the probability that one such phone number , the last four digits do not include any zero:-
Then , the probability that for one such phone number, the last four digits include at least one 0:-
Hence, the probability that for one such phone number, the last four digits include at least one 0 is 0.3439 .