Assume that mid-upper arm circumferences in a population of rural Indian children aged 12 to 60 months follows a normal distribution with an unknown mean. Ten samples, each of four children are drawn from this population by a formal process of random sampling with replacement. The results are in table below.

What is the standard error of the mean for random sample 10?

Mid-upper arm circumference (mm) in a rural Indian population aged 12 to 60 months (10 random samples of size 4)

1). Approximately 8.5

2). 6.2

3). Approximately 4

4). 2.9

Sample Observations X Sample mean Standard deviation (mm) 128, 162, 158, 156 151 15.53 N 148, 148, 146, 136 144.5 5.74 164, 150, 148, 158 155 7.39 4 154, 172, 128, 136 147.5 19.62 5 144, 158, 154, 168 156 9.93 6 136, 140, 128 , 138 135.5 5.26 V 144, 158, 140, 142 146 8.16 154, 148, 148, 138 147 6.63 9 154, 140, 154, 152 150 6.73 10 156, 154, 140, 158 152 8.16