Answer:
50% of the scores were above 75
Step-by-step explanation:
Problems of normally distributed(bell-shaped) samples are solved using the z-score formula.
In a set with mean and standard deviation , the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this problem, we have that:
What percent of the scores were above 75?
This is 1 subtracted by the pvalue of Z when X = 75. So
has a pvalue of 0.5
1 - 0.5 = 0.5
50% of the scores were above 75
The right answer to 1b is 1 5/8 and the right answer to number 1e is 1 3/7. The way I solved this was by starting out adding two fractions at a time...
1b). 5/8 + 5/8 + 3/8
5/8 + 5/8 = 10/8 or 1 1/4
10/8 + 3/8 = 13/8 or 1 5/8.
1e). 5/7 + 1/7 + 4/7
5/7 + 1/7 = 6/7
6/7 + 4/7 = 10/7 or 1 3/7
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The answer is three. i think you know where three is located in a number line
Answer:
22
Step-by-step explanation:
Order of Operations: BPEMDAS
Step 1: Write out expression
40 - 2 × 3²
Step 2: Exponents
40 - 2 × 9
Step 3: Multiply
40 - 18
Step 4: Subtract
22
Answer:
-3 sqrt 2 or -4.242640687
Step-by-step explanation: