7. A traffic safety expert claimed that for car vs. bicycle accidents in which the bicyclist was injured, 40% of the injuries were head injuries, 40% were arm and/or leg injuries, and 20% were other injuries. A random sample of 150 injured bicyclists showed 70 had head injuries, 60 had arm or leg injuries, and 20 had other injuries. Perform a hypothesis test at 95% confidence to determine whether the safety expert's claim could be true. To get full credit state your null and alternate hypothesis, show how you calculated your test statistic, show your p-value, and state your conclusion: could the safety expert's claim be true? YES or NO