In a sample of 23 hip surgeries, the mean surgery time was found to be 136.9 minutes, with a standard deviation of 22.6 minutes. Compute a 95% confidence interval for the mean length of all hip surgeries.

With alll of except for the 2 that i did already

[tex]5 \times1 \frac{12}{13} [/tex] me

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad