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Write a program named “count letters” that counts the occurrences of all small and capital letters in given be? Write a program named “count letters” that counts the occurrences of all small and capital letters in given below string and then prints the result in the format (Caps, count:: Small...

...sample of 49 pens is tested, and? A certain type of pen is claimed to operate for a mean of 190 hours. A random sample of 49 pens is tested, and the mean operating time is found to be 188 hours with a standard deviation of 6 hours. Construct a 95% confidence interval for the true mean...