Which body part is the same length as the persons length?
2 answers:
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Answer:
To reach her goal in the first 100 serves she has to have 50 successful services. This happens with a probability of 2%.
That means she has 98% chances of needing more than 100 serves to reach her goal.
Step-by-step explanation:
The condition for Jo to need more than 100 serves is that she do not accomplish 50 successful serves in 100 tries.
We have a probability sample of possible results that hass a binomial distribution, with n=100 and p=0.4.
As n is large enough, we will approximate it with a normal distribution. The parameters of the normal distribution are:
We need the to calculate the probability that the amount of successful services is less than 50, so that she needs more than 100 serves. This is:
We calculate the z value for X:
Then we have
That means that there is 98% probability that she will need more than 100 serves to reach her goal.