The batting averages of the first three batters in the Eureka College women’s softball team lineup are .310, .301, and .277. If the first three batters are considered as the “lead-off group”, what is the batting average of the group?
2 answers
mean = ∑x/n = (.310 + .301 + .277)/3 = ?
1. On the basis of past experience, the buyer for a large sports store estimates that the number of 10-speed bicycles sole next year will be somewhere between 40 and 90 – with the following distribution:
Number of Bicycles Sold x Probability P(x)
40 0.05
50 0.15
60 0.41
70 0.34
80 0.04
90 0.01
a. What is the mean number sold? What is the standard deviation?
b. If 60 are ordered, what is the chance they will all be sold? What is the chance some will be left over?
c. To be almost sure (say, 95% sure) of having enough bicycles, how many should be ordered?
Number of Bicycles Sold x Probability P(x)
40 0.05
50 0.15
60 0.41
70 0.34
80 0.04
90 0.01
a. What is the mean number sold? What is the standard deviation?
b. If 60 are ordered, what is the chance they will all be sold? What is the chance some will be left over?
c. To be almost sure (say, 95% sure) of having enough bicycles, how many should be ordered?
3 answers