At Least One Defective Ultrasound Transducer A study showed that 39.8% of ultrasound transducers are defective (based on data from “High Incidence of Defective Ultrasound Transducers in Use in Routine Clinical Practice,” by Martensson et al., European Journal of Echocardiography, Vol. 10, No. 1093.) An engineer needs at least one defective ultrasound transducer so she can try to identify the problem. If she randomly selects 10 ultrasound transducers from a very large batch, what is the probability that she will get at least one that is defective?

Is that probability high enough so that she can be reasonably sure of getting a defective transducer for her work?