Given a mean of 8 and a standard deviation of 0.7, within how many standard deviations of the mean do the values 7.7, 8.4, 9, 8,
1 answer:
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answer: -5
work:
set up as fractions.
multiply across to solve.
so, multiply -2 x 8 and 1 x 3.
you get
or, -5
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Answer:
The best estimate for the value of the given expression is -2 1/2. Correct: Second alternative
Explanation:
<u>Estimate and Number Rounding</u>
There are situations where numbers must be estimated according to certain rules. If we have a number and we need a good approximate to it, we can use rounding to the required number of decimals.
The question requires to find the best estimate for the operation:
We calculate the decimal value of the expression:
The first alternative is incorrect. It's a good approximation because it's close to the number, but the next alternative is the closest of all choices.
The second alternative Is correct. The value of -2 1/2 is -2.5. The number -2.64 is closer to -2.5 than to -3 which is the alternative A.
The third alternative Is incorrect. 7 is a positive number and it's not even close to -2.64
The last alternative Is incorrect. 7 1/2 = 7.5 is a positive number and it's not even close to -2.64