What is the probability that a random sample of 10 2nd grade students results in a mean reading rate of more than 98 words per min.?
Update:
The reading speed of second grade students in a large city is approximately normal, with a mean of 92
words per minute (wpm) and a standard deviation of 10 wpm.
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Answers & Comments
There is critical info left out of your question, like the population mean and std dev of the reading rate of 2nd grade students - do you think this question can really be answered from what you've provided? Do you proofread your questions before you submit them?
If 2nd grade means 7 and 8 years old, I would expect the probability is zero.
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With your update, the value of 98 is z = 0.6 standard deviations above the mean. What is the probability for that z-score? That's for a single student. What is probability for the mean of a group of 10 students?