Mathematics, 22.12.2019 12:31 rania32
The probability that sandra gets a ride to work on any morning is 0.7. the probability that she gets a ride 3 times in a 5-day work week is and the probability that she gets a ride at least 2 times in a 5-day workweek is
Answers: 2
![P[X=r]=^nC_rp^rq^{n-r}](/tpl/images/0429/7670/7bcfd.png)
, where n is the number of trials , r is the number of success, p is the probability of success and q is the probability of failure.![P[X=3]=^5C_3(0.7)^3(0.3)^{5-3}\\\\=10(0.7)^3(0.3)^2=0.3087\approx0.31](/tpl/images/0429/7670/e54bc.png)
![P[X\geq2]=1-P[X](/tpl/images/0429/7670/299ae.png)
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The probability that sandra gets a ride to work on any morning is 0.7. the probability that she gets...
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