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Liula [17]
3 years ago
8

Kayla squared a number x and added this result to -6.5. This gave her an answer of 42.5.

Mathematics
1 answer:
ladessa [460]3 years ago
7 0

Answer:

7, -7

Step-by-step explanation:

x^2-6.5= 42.5 add 6.5 to both sides

x^2= 49

The square root of 49 is 7 and -7.

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On a test that has a normal distribution, a score of 60 falls two standard deviations above the mean, and a score of 42 falls on
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Answer:

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Step-by-step explanation:

Given that:

A  \ score  \ of \  60  \ falls \  two  \ standard   \ deviations \  above \  the \ mean \\ \\ A \  score \ of \ 42  \ falls \  one  \ standard  \ deviation \ below  \ the \ m ean

The interval for score = 60 - 42 = 18

If we divide it by the 3 standard deviations; the interval result into

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So, the standard deviation is 6, and the mean = 42 + 6

= 48

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