# Z-score for confidence interval

What is the z-score for Confidence Interval of 97% and what is the formula to find it?

# Calculation of half life

If 24% sample zinc,65 decays in 70 days what is the half life of the isotope

# How many minutes in a year

how many minutes are there in a year (365 days)?

Show how you obtained the solution

# How many minutes in a day

How many minutes are there in a day? Show working for how you obtained the solution

# How many seconds in a day

How many seconds are there in a day and how does one calculate that?

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probability question

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Suppose that Mr, Binda buys a three-month 5,000 contract

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Write an expression to detect that the first character of userInput matches firstLetter.

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Write an expression to detect that the first character of userInput matches firstLetter.

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