Abby did 121 situps in 8 mins esitimate the number of situps she did in one min
2 answers:
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Answer:
9/14
Step-by-step explanation:
The question is not clear enough. Here is a similar question as shown in the attachment
Given the expression
-3/2 ÷ -7/3
= -3/2 ×-3/7
= (-3*-3)/(2*7)
= 9/14
Hence the equivalent result expressed as a fraction is 9/14
Answer:
a) 25
b) 49
c) 97
Step-by-step explanation:
The sample size is calculated using the formula, n =
Now,
for 95% confidence level value of z-factor = 1.96
Given:
Mean = $3.94
standard deviation = $0.25
thus,
a) for margin of error = $0.10
n =
or
n =
or
n = 4.9²
or
n = 24.01 ≈ 25 (Rounded off to next integer)
b) for margin of error = $0.07
n =
or
n =
or
n = 7²
or
n = 49
c) for margin of error = $0.05
n =
or
n =
or
n = 9.8²
or
n = 96.04 ≈ 97 (Rounded off to next integer)